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Germann, Matthias
Publications (10 of 13) Show all publications
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.
Open this publication in new window or tab >>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 (English)In: Journal of Quantitative Spectroscopy and Radiative Transfer, ISSN 0022-4073, E-ISSN 1879-1352, Vol. 312, article id 108782Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
Elsevier, 2024
Keywords
Empirical line list, Formaldehyde, Fourier transform spectroscopy, Frequency comb spectroscopy, High-resolution spectroscopy, MARVEL
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-215854 (URN)10.1016/j.jqsrt.2023.108782 (DOI)2-s2.0-85174165539 (Scopus ID)
Funder
Knut and Alice Wallenberg Foundation, KAW 2015.0159Knut and Alice Wallenberg Foundation, KAW 2020.0303Swedish Research Council, 2016-03593Swedish Research Council, 2020-00238EU, Horizon 2020, 883830
Available from: 2023-11-02 Created: 2023-11-02 Last updated: 2023-11-10Bibliographically approved
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.
Open this publication in new window or tab >>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 (English)In: 2023 conference on lasers and electro-optics Europe & European quantum electronics conference (CLEO/Europe-EQEC), IEEE, 2023, article id 10232703Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
IEEE, 2023
Series
Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference, ISSN 2639-5452, E-ISSN 2833-1052
National Category
Atom and Molecular Physics and Optics
Identifiers
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)
Conference
2023 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2023, Munich, June 26-30, 2023
Funder
Knut and Alice Wallenberg Foundation, 2015.0159Knut and Alice Wallenberg Foundation, 2020.0303Swedish Research Council, 2016-03593EU, European Research Council, 883830
Available from: 2023-11-21 Created: 2023-11-21 Last updated: 2023-11-21Bibliographically approved
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.
Open this publication in new window or tab >>Precision frequency comb spectroscopy in the 8 µm range
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2023 (English)In: CLEO 2023: Proceedings, Optical Society of America, 2023, article id AW4E.1Conference paper, Published paper (Refereed)
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.

Place, publisher, year, edition, pages
Optical Society of America, 2023
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-216879 (URN)10.1364/CLEO_AT.2023.AW4E.1 (DOI)2-s2.0-85176375313 (Scopus ID)9781957171258 (ISBN)
Conference
2023 Conference on Lasers and Electro-Optics, CLEO 2023, San Jose, USA, May 7-12, 2023
Available from: 2023-12-12 Created: 2023-12-12 Last updated: 2024-05-13Bibliographically approved
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.
Open this publication in new window or tab >>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 (English)In: Journal of Quantitative Spectroscopy and Radiative Transfer, ISSN 0022-4073, E-ISSN 1879-1352, Vol. 288, article id 108252Article in journal (Refereed) 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.

Keywords
(Exo-)Planetary atmospheres, Atmospheric window, Fourier transform spectroscopy, High-resolution spectroscopy, Methane, Optical frequency comb
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-196126 (URN)10.1016/j.jqsrt.2022.108252 (DOI)000811064700004 ()2-s2.0-85130577614 (Scopus ID)
Available from: 2022-06-15 Created: 2022-06-15 Last updated: 2023-11-10Bibliographically approved
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.
Open this publication in new window or tab >>An Accurate Methane Line List in the 7.2-8.0 µm Range from Comb-Based Fourier Transform Spectroscopy
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2022 (English)In: CLEO: 2022: Conference on Lasers and Electro-Optics, Optica Publishing Group , 2022, article id SM3F.6Conference paper, Published paper (Refereed)
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.

Place, publisher, year, edition, pages
Optica Publishing Group, 2022
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-199215 (URN)2-s2.0-85136788463 (Scopus ID)9781557528209 (ISBN)
Conference
CLEO: Science and Innovations, San Jose, California, USA, May 15-20, 2022
Available from: 2022-09-08 Created: 2022-09-08 Last updated: 2023-03-24Bibliographically approved
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.
Open this publication in new window or tab >>An Accurate Methane Line List in the 7.2-8.0 μm Range from Comb-Based Fourier Transform Spectroscopy
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2022 (English)In: 2022 Conference on Lasers and Electro-Optics, CLEO 2022 - Proceedings, Optica Publishing Group , 2022, article id SM3F.6Conference paper, Published paper (Refereed)
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.

Place, publisher, year, edition, pages
Optica Publishing Group, 2022
Series
Technical Digest Series (Optica Publishing Group, 2022)
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-200559 (URN)10.1364/CLEO_SI.2022.SM3F.6 (DOI)2-s2.0-85139918034 (Scopus ID)9781957171050 (ISBN)
Conference
Conference on Lasers and Electro-Optics, CLEO 2022, 15–20 May 2022, San Jose, California, United States
Funder
Knut and Alice Wallenberg Foundation, KAW 2015.0159Knut and Alice Wallenberg Foundation, 2020.0303Swedish Research Council, 2016-03593
Available from: 2022-12-20 Created: 2022-12-20 Last updated: 2023-03-24Bibliographically approved
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.
Open this publication in new window or tab >>Compact fiber-based mid-infrared frequency comb sources
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2022 (English)In: Optica High-brightness Sources and Light-driven Interactions Congress 2022, Optica Publishing Group (formerly OSA) , 2022, article id MW6C.1Conference paper, Published paper (Refereed)
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.

Place, publisher, year, edition, pages
Optica Publishing Group (formerly OSA), 2022
Series
Technical Digest Series (Optica Publishing Group, 2022)
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-199116 (URN)10.1364/MICS.2022.MW6C.1 (DOI)2-s2.0-85136413238 (Scopus ID)9781557528209 (ISBN)
Conference
Mid-Infrared Coherent Sources, MICS 2022, March 23-25 2022, Budapest, Hungary
Available from: 2022-09-07 Created: 2022-09-07 Last updated: 2023-03-24Bibliographically approved
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.
Open this publication in new window or tab >>Fourier transform spectroscopy using difference frequency generation comb sources at 3.3 µm and 7.8 µm
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2021 (English)In: Proceedings OSA Optical Sensors and Sensing Congress 2021 (AIS, FTS, HISE, SENSORS, ES), Optical Society of America, 2021, article id JTu4D.3Conference paper, Published paper (Refereed)
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

Place, publisher, year, edition, pages
Optical Society of America, 2021
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-189943 (URN)10.1364/AIS.2021.JTu4D.3 (DOI)2-s2.0-85119360459 (Scopus ID)9781557528209 (ISBN)
Conference
Applied Industrial Spectroscopy, AIS 2021 - Part of Optical Sensors and Sensing Congress 2021, Washington - USA / Virtual, July 19-23, 2021
Funder
Knut and Alice Wallenberg Foundation, 2015.0159Swedish Research Council, 2016-03593
Available from: 2021-11-29 Created: 2021-11-29 Last updated: 2021-11-29Bibliographically approved
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
Open this publication in new window or tab >>Frequency comb fourier transform spectroscopy at 8 µm using a compact difference frequency generation source
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2021 (English)In: 2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), IEEE, 2021Conference paper, Oral presentation with published abstract (Refereed)
Place, publisher, year, edition, pages
IEEE, 2021
Series
Optics Infobase conference papers series, E-ISSN 2162-2701
National Category
Atom and Molecular Physics and Optics
Identifiers
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)
Conference
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
Available from: 2023-08-14 Created: 2023-08-14 Last updated: 2023-08-14Bibliographically approved
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
Open this publication in new window or tab >>Frequency Comb Fourier Transform Spectroscopy at 8m Using a Compact Difference Frequency Generation Source
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2021 (English)In: 2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021, IEEE Lasers and Electro-Optics Society, 2021Conference paper, Oral presentation with published abstract (Refereed)
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.

Place, publisher, year, edition, pages
IEEE Lasers and Electro-Optics Society, 2021
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-189077 (URN)10.1109/CLEO/Europe-EQEC52157.2021.9541867 (DOI)000728078300283 ()2-s2.0-85117599442 (Scopus ID)9781665418768 (ISBN)
Conference
2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021, Munich, Germany, 21-25 June 2021.
Available from: 2021-11-04 Created: 2021-11-04 Last updated: 2023-09-05Bibliographically approved
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