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Germann, Matthias
Publikationer (10 of 13) Visa alla publikationer
Germann, M., Hjältén, A., Tennyson, J., Yurchenko, S. N., Gordon, I. E., Pett, C., . . . Foltynowicz, A. (2024). Optical frequency comb Fourier transform spectroscopy of formaldehyde in the 1250 to 1390 cm−1 range: experimental line list and improved MARVEL analysis. Journal of Quantitative Spectroscopy and Radiative Transfer, 312, Article ID 108782.
Öppna denna publikation i ny flik eller fönster >>Optical frequency comb Fourier transform spectroscopy of formaldehyde in the 1250 to 1390 cm−1 range: experimental line list and improved MARVEL analysis
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2024 (Engelska)Ingår i: Journal of Quantitative Spectroscopy and Radiative Transfer, ISSN 0022-4073, E-ISSN 1879-1352, Vol. 312, artikel-id 108782Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We use optical frequency comb Fourier transform spectroscopy to record high-resolution, low-pressure, room-temperature spectra of formaldehyde (H212C16O) in the range of 1250 to 1390 cm−1. Through line-by-line fitting, we retrieve line positions and intensities of 747 rovibrational transitions: 558 from the ν6 band, 129 from the ν4 band, and 14 from the ν3 band, as well as 46 from four different hot bands. We incorporate the accurate and precise line positions (0.4 MHz median uncertainty) into the MARVEL (measured active vibration-rotation energy levels) analysis of the H2CO spectrum. This increases the number of MARVEL-predicted energy levels by 82 and of rovibrational transitions by 5382, and substantially reduces uncertainties of MARVEL-derived H2CO energy levels over a large range: from pure rotational levels below 200 cm−1 up to multiply excited vibrational levels at 6000 cm−1. This work is an important step toward filling the gaps in formaldehyde data in the HITRAN database.

Ort, förlag, år, upplaga, sidor
Elsevier, 2024
Nyckelord
Empirical line list, Formaldehyde, Fourier transform spectroscopy, Frequency comb spectroscopy, High-resolution spectroscopy, MARVEL
Nationell ämneskategori
Atom- och molekylfysik och optik
Identifikatorer
urn:nbn:se:umu:diva-215854 (URN)10.1016/j.jqsrt.2023.108782 (DOI)2-s2.0-85174165539 (Scopus ID)
Forskningsfinansiär
Knut och Alice Wallenbergs Stiftelse, KAW 2015.0159Knut och Alice Wallenbergs Stiftelse, KAW 2020.0303Vetenskapsrådet, 2016-03593Vetenskapsrådet, 2020-00238EU, Horisont 2020, 883830
Tillgänglig från: 2023-11-02 Skapad: 2023-11-02 Senast uppdaterad: 2023-11-10Bibliografiskt granskad
Germann, M., Hjältén, A., Boudon, V., Richard, C., Tennyson, J., Yurchenko, S., . . . Foltynowicz, A. (2023). High accuracy line lists of CH4 and H2CO in the 8 µm range from optical frequency comb fourier transform spectroscopy. In: 2023 conference on lasers and electro-optics Europe & European quantum electronics conference (CLEO/Europe-EQEC): . Paper presented at 2023 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2023, Munich, June 26-30, 2023. IEEE, Article ID 10232703.
Öppna denna publikation i ny flik eller fönster >>High accuracy line lists of CH4 and H2CO in the 8 µm range from optical frequency comb fourier transform spectroscopy
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2023 (Engelska)Ingår i: 2023 conference on lasers and electro-optics Europe & European quantum electronics conference (CLEO/Europe-EQEC), IEEE, 2023, artikel-id 10232703Konferensbidrag, Publicerat paper (Refereegranskat)
Ort, förlag, år, upplaga, sidor
IEEE, 2023
Serie
Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference, ISSN 2639-5452, E-ISSN 2833-1052
Nationell ämneskategori
Atom- och molekylfysik och optik
Identifikatorer
urn:nbn:se:umu:diva-216799 (URN)10.1109/CLEO/EUROPE-EQEC57999.2023.10232703 (DOI)2-s2.0-85175718241 (Scopus ID)9798350345995 (ISBN)9798350346008 (ISBN)
Konferens
2023 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2023, Munich, June 26-30, 2023
Forskningsfinansiär
Knut och Alice Wallenbergs Stiftelse, 2015.0159Knut och Alice Wallenbergs Stiftelse, 2020.0303Vetenskapsrådet, 2016-03593EU, Europeiska forskningsrådet, 883830
Tillgänglig från: 2023-11-21 Skapad: 2023-11-21 Senast uppdaterad: 2023-11-21Bibliografiskt granskad
Germann, M., Hjältén, A., Gordon, I. E., Tennyson, J., Yurchenko, S., Krzempek, K., . . . Foltynowicz, A. (2023). Precision frequency comb spectroscopy in the 8 µm range. In: CLEO 2023: proceedings. Paper presented at 2023 Conference on Lasers and Electro-Optics, CLEO 2023, San Jose, USA, May 7-12, 2023. Optical Society of America, Article ID AW4E.1.
Öppna denna publikation i ny flik eller fönster >>Precision frequency comb spectroscopy in the 8 µm range
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2023 (Engelska)Ingår i: CLEO 2023: proceedings, Optical Society of America, 2023, artikel-id AW4E.1Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

We use Fourier transform spectroscopy based on a compact difference frequency generation comb source emitting around 8 μm to record broadband high-resolution spectra of molecules relevant to astrophysics and environmental monitoring. From the spectra we obtain line lists with sub-MHz accuracy, an order of magnitude better than previously available, and use them to refine theoretical models of these molecules. Here we report results for formaldehyde, for which the 8 μm range is missing in HITRAN.

Ort, förlag, år, upplaga, sidor
Optical Society of America, 2023
Nationell ämneskategori
Atom- och molekylfysik och optik
Identifikatorer
urn:nbn:se:umu:diva-216879 (URN)10.1364/CLEO_AT.2023.AW4E.1 (DOI)2-s2.0-85176375313 (Scopus ID)9781957171258 (ISBN)
Konferens
2023 Conference on Lasers and Electro-Optics, CLEO 2023, San Jose, USA, May 7-12, 2023
Tillgänglig från: 2023-12-12 Skapad: 2023-12-12 Senast uppdaterad: 2024-05-28Bibliografiskt granskad
Germann, M., Hjältén, A., Boudon, V., Richard, C., Krzempek, K., Hudzikowski, A., . . . Foltynowicz, A. (2022). A methane line list with sub-MHz accuracy in the 1250 to 1380 cm−1 range from optical frequency comb Fourier transform spectroscopy. Journal of Quantitative Spectroscopy and Radiative Transfer, 288, Article ID 108252.
Öppna denna publikation i ny flik eller fönster >>A methane line list with sub-MHz accuracy in the 1250 to 1380 cm−1 range from optical frequency comb Fourier transform spectroscopy
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2022 (Engelska)Ingår i: Journal of Quantitative Spectroscopy and Radiative Transfer, ISSN 0022-4073, E-ISSN 1879-1352, Vol. 288, artikel-id 108252Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We use a Fourier transform spectrometer based on a difference frequency generation optical frequency comb to measure high-resolution, low-pressure, room-temperature spectra of methane in the 1250 – 1380-cm−1 range. From these spectra, we retrieve line positions and intensities of 678 lines of two isotopologues: 157 lines from the 12CH4 ν4 fundamental band, 131 lines from the 13CH4 ν4 fundamental band, as well as 390 lines from two 12CH4 hot bands, ν2 + ν4 ν2 and 2ν4ν4. For another 165 lines from the 12CH4 ν4 fundamental band we retrieve line positions only. The uncertainties of the line positions range from 0.19 to 2.3 MHz, and their median value is reduced by a factor of 18 and 59 compared to the previously available data for the 12CH4 fundamental and hot bands, respectively, obtained from conventional FTIR absorption measurements. The new line positions are included in the global models of the spectrum of both methane isotopologues, and the fit residuals are reduced by a factor of 8 compared to previous absorption data, and 20 compared to emission data. The experimental line intensities have relative uncertainties in the range of 1.5 – 7.7%, similar to those in the previously available data; 235 new 12CH4 line intensities are included in the global model.

Nyckelord
(Exo-)Planetary atmospheres, Atmospheric window, Fourier transform spectroscopy, High-resolution spectroscopy, Methane, Optical frequency comb
Nationell ämneskategori
Atom- och molekylfysik och optik
Identifikatorer
urn:nbn:se:umu:diva-196126 (URN)10.1016/j.jqsrt.2022.108252 (DOI)000811064700004 ()2-s2.0-85130577614 (Scopus ID)
Tillgänglig från: 2022-06-15 Skapad: 2022-06-15 Senast uppdaterad: 2023-11-10Bibliografiskt granskad
Germann, M., Hjältén, A., Boudon, V., Richard, C., Krzempek, K., Hudzikowski, A., . . . Foltynowicz, A. (2022). An Accurate Methane Line List in the 7.2-8.0 µm Range from Comb-Based Fourier Transform Spectroscopy. In: CLEO: 2022: Conference on Lasers and Electro-Optics. Paper presented at CLEO: Science and Innovations, San Jose, California, USA, May 15-20, 2022. Optica Publishing Group, Article ID SM3F.6.
Öppna denna publikation i ny flik eller fönster >>An Accurate Methane Line List in the 7.2-8.0 µm Range from Comb-Based Fourier Transform Spectroscopy
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2022 (Engelska)Ingår i: CLEO: 2022: Conference on Lasers and Electro-Optics, Optica Publishing Group , 2022, artikel-id SM3F.6Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

We use comb-based Fourier transform spectroscopy to record high-resolution spectra of 12CH4 and 13CH4 from 1250 to 1380 cm-1. We obtain line positions and intensities of 4 bands with uncertainties of ~450 kHz and ~3%, respectively, which we use to improve a global fit of the effective Hamiltonian.

Ort, förlag, år, upplaga, sidor
Optica Publishing Group, 2022
Nationell ämneskategori
Atom- och molekylfysik och optik
Identifikatorer
urn:nbn:se:umu:diva-199215 (URN)2-s2.0-85136788463 (Scopus ID)9781557528209 (ISBN)
Konferens
CLEO: Science and Innovations, San Jose, California, USA, May 15-20, 2022
Tillgänglig från: 2022-09-08 Skapad: 2022-09-08 Senast uppdaterad: 2023-03-24Bibliografiskt granskad
Germann, M., Hjältén, A., Boudon, V., Richard, C., Krzempek, K., Hudzikowski, A., . . . Foltynowicz, A. (2022). An Accurate Methane Line List in the 7.2-8.0 μm Range from Comb-Based Fourier Transform Spectroscopy. In: 2022 Conference on Lasers and Electro-Optics, CLEO 2022 - Proceedings: . Paper presented at Conference on Lasers and Electro-Optics, CLEO 2022, 15–20 May 2022, San Jose, California, United States. Optica Publishing Group, Article ID SM3F.6.
Öppna denna publikation i ny flik eller fönster >>An Accurate Methane Line List in the 7.2-8.0 μm Range from Comb-Based Fourier Transform Spectroscopy
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2022 (Engelska)Ingår i: 2022 Conference on Lasers and Electro-Optics, CLEO 2022 - Proceedings, Optica Publishing Group , 2022, artikel-id SM3F.6Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

We use comb-based Fourier transform spectroscopy to record high-resolution spectra of 12CH4 and 13CH4 from 1250 to 1380 cm-1. We obtain line positions and intensities of 4 bands with uncertainties of ~450 kHz and ~3%, respectively, which we use to improve a global fit of the effective Hamiltonian.

Ort, förlag, år, upplaga, sidor
Optica Publishing Group, 2022
Serie
Technical Digest Series (Optica Publishing Group, 2022)
Nationell ämneskategori
Atom- och molekylfysik och optik
Identifikatorer
urn:nbn:se:umu:diva-200559 (URN)10.1364/CLEO_SI.2022.SM3F.6 (DOI)2-s2.0-85139918034 (Scopus ID)9781957171050 (ISBN)
Konferens
Conference on Lasers and Electro-Optics, CLEO 2022, 15–20 May 2022, San Jose, California, United States
Forskningsfinansiär
Knut och Alice Wallenbergs Stiftelse, KAW 2015.0159Knut och Alice Wallenbergs Stiftelse, 2020.0303Vetenskapsrådet, 2016-03593
Tillgänglig från: 2022-12-20 Skapad: 2022-12-20 Senast uppdaterad: 2023-03-24Bibliografiskt granskad
Krzempek, K., Tomaszewska-Rolla, D., Gluszek, A., Hudzikowski, A., Krakowski, M., Hjältén, A., . . . Sobon, G. (2022). Compact fiber-based mid-infrared frequency comb sources. In: Optica High-brightness Sources and Light-driven Interactions Congress 2022: . Paper presented at Mid-Infrared Coherent Sources, MICS 2022, March 23-25 2022, Budapest, Hungary. Optica Publishing Group (formerly OSA), Article ID MW6C.1.
Öppna denna publikation i ny flik eller fönster >>Compact fiber-based mid-infrared frequency comb sources
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2022 (Engelska)Ingår i: Optica High-brightness Sources and Light-driven Interactions Congress 2022, Optica Publishing Group (formerly OSA) , 2022, artikel-id MW6C.1Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

We report the development of compact, stabilized fiber-based mid-infrared frequency comb sources covering the 7–9 μm and 3.1–3.4 μm spectral ranges. Both sources enable high-precision Fourier-transform spectroscopy of greenhouse gases.

Ort, förlag, år, upplaga, sidor
Optica Publishing Group (formerly OSA), 2022
Serie
Technical Digest Series (Optica Publishing Group, 2022)
Nationell ämneskategori
Atom- och molekylfysik och optik
Identifikatorer
urn:nbn:se:umu:diva-199116 (URN)10.1364/MICS.2022.MW6C.1 (DOI)2-s2.0-85136413238 (Scopus ID)9781557528209 (ISBN)
Konferens
Mid-Infrared Coherent Sources, MICS 2022, March 23-25 2022, Budapest, Hungary
Tillgänglig från: 2022-09-07 Skapad: 2022-09-07 Senast uppdaterad: 2023-03-24Bibliografiskt granskad
Hjältén, A., Germann, M., Sadiek, I., Lu, C., Vieira, F. S., Krzempek, K., . . . Foltynowicz, A. (2021). Fourier transform spectroscopy using difference frequency generation comb sources at 3.3 µm and 7.8 µm. In: Proceedings OSA Optical Sensors and Sensing Congress 2021 (AIS, FTS, HISE, SENSORS, ES): . Paper presented at Applied Industrial Spectroscopy, AIS 2021 - Part of Optical Sensors and Sensing Congress 2021, Washington - USA / Virtual, July 19-23, 2021. Optical Society of America, Article ID JTu4D.3.
Öppna denna publikation i ny flik eller fönster >>Fourier transform spectroscopy using difference frequency generation comb sources at 3.3 µm and 7.8 µm
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2021 (Engelska)Ingår i: Proceedings OSA Optical Sensors and Sensing Congress 2021 (AIS, FTS, HISE, SENSORS, ES), Optical Society of America, 2021, artikel-id JTu4D.3Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

We use offset-frequency-free difference frequency generation comb sources and a Fourier transform spectrometer with comb-mode-width limited resolution to measure and analyze spectra of molecular species of atmospheric relevance: CH3I and CH2Br2 around 3000 cm-1, and 14N216O around 1280 cm-1

Ort, förlag, år, upplaga, sidor
Optical Society of America, 2021
Nationell ämneskategori
Atom- och molekylfysik och optik
Identifikatorer
urn:nbn:se:umu:diva-189943 (URN)10.1364/AIS.2021.JTu4D.3 (DOI)2-s2.0-85119360459 (Scopus ID)9781557528209 (ISBN)
Konferens
Applied Industrial Spectroscopy, AIS 2021 - Part of Optical Sensors and Sensing Congress 2021, Washington - USA / Virtual, July 19-23, 2021
Forskningsfinansiär
Knut och Alice Wallenbergs Stiftelse, 2015.0159Vetenskapsrådet, 2016-03593
Tillgänglig från: 2021-11-29 Skapad: 2021-11-29 Senast uppdaterad: 2021-11-29Bibliografiskt granskad
Germann, M., Hjältén, A., Krzempek, K., Hudzikowski, A., Gluszek, A., Tomaszewska, D., . . . Foltynowicz, A. (2021). Frequency comb fourier transform spectroscopy at 8 µm using a compact difference frequency generation source. In: 2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC): . Paper presented at 2021 European Quantum Electronics Conference, EQEC 2021 - Part of 2021 Conference on Lasers and Electro-Optics Europe, CLEO 2021, Munich, Germany,une 21-25, 2021. IEEE
Öppna denna publikation i ny flik eller fönster >>Frequency comb fourier transform spectroscopy at 8 µm using a compact difference frequency generation source
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2021 (Engelska)Ingår i: 2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), IEEE, 2021Konferensbidrag, Muntlig presentation med publicerat abstract (Refereegranskat)
Ort, förlag, år, upplaga, sidor
IEEE, 2021
Serie
Optics Infobase conference papers series, E-ISSN 2162-2701
Nationell ämneskategori
Atom- och molekylfysik och optik
Identifikatorer
urn:nbn:se:umu:diva-212860 (URN)10.1109/CLEO/Europe-EQEC52157.2021.9541867 (DOI)2-s2.0-85166461353 (Scopus ID)978-1-6654-1876-8 (ISBN)978-1-6654-4804-8 (ISBN)
Konferens
2021 European Quantum Electronics Conference, EQEC 2021 - Part of 2021 Conference on Lasers and Electro-Optics Europe, CLEO 2021, Munich, Germany,une 21-25, 2021
Tillgänglig från: 2023-08-14 Skapad: 2023-08-14 Senast uppdaterad: 2023-08-14Bibliografiskt granskad
Germann, M., Hjältén, A., Krzempek, K., Hudzikowski, A., Gluszek, A., Tomaszewska, D., . . . Foltynowicz, A. (2021). Frequency Comb Fourier Transform Spectroscopy at 8m Using a Compact Difference Frequency Generation Source. In: 2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021: . Paper presented at 2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021, Munich, Germany, 21-25 June 2021.. IEEE Lasers and Electro-Optics Society
Öppna denna publikation i ny flik eller fönster >>Frequency Comb Fourier Transform Spectroscopy at 8m Using a Compact Difference Frequency Generation Source
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2021 (Engelska)Ingår i: 2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021, IEEE Lasers and Electro-Optics Society, 2021Konferensbidrag, Muntlig presentation med publicerat abstract (Refereegranskat)
Abstract [en]

Mid-infrared comb-based Fourier transform spectroscopy allows high-resolution measurements of entire molecular absorption bands. However, most previous implementations were limited to wavelengths <5m. We present a Fourier transform spectrometer (FTS) with a comb-mode-limited resolution based on a compact difference frequency generation (DFG) source operating around 8m. We measure the spectrum of the ν 1 band of N 2 O in the Doppler limit and retrieve line center frequencies with precision of the order of 100 kHz.

Ort, förlag, år, upplaga, sidor
IEEE Lasers and Electro-Optics Society, 2021
Nationell ämneskategori
Atom- och molekylfysik och optik
Identifikatorer
urn:nbn:se:umu:diva-189077 (URN)10.1109/CLEO/Europe-EQEC52157.2021.9541867 (DOI)000728078300283 ()2-s2.0-85117599442 (Scopus ID)9781665418768 (ISBN)
Konferens
2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021, Munich, Germany, 21-25 June 2021.
Tillgänglig från: 2021-11-04 Skapad: 2021-11-04 Senast uppdaterad: 2023-09-05Bibliografiskt granskad
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