1
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Pachucki K, Komasa J. Relativistic Correction from the Four-Body Nonadiabatic Exponential Wave Function. J Chem Theory Comput 2024; 20:8644-8651. [PMID: 39327784 PMCID: PMC11465460 DOI: 10.1021/acs.jctc.4c00861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2024] [Revised: 09/12/2024] [Accepted: 09/12/2024] [Indexed: 09/28/2024]
Abstract
We present a method for calculating the relativistic correction in hydrogen molecules that significantly exceeds the accuracy of all the previous literature results. This method utilizes the explicitly correlated nonadiabatic exponential wave function, and thus treats electrons and nuclei equivalently. The proposed method can be applied to any rovibrational state, including highly excited ones. The numerical precision of the relativistic correction reaches several kHz (∼10-7 cm-1), which is below the best experimental accuracy.
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Affiliation(s)
- Krzysztof Pachucki
- Faculty
of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
| | - Jacek Komasa
- Faculty
of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego
8, 61-614 Poznań, Poland
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2
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Cozijn FMJ, Diouf ML, Ubachs W, Hermann V, Schlösser M. Precision Measurement of Vibrational Quanta in Tritium Hydride. PHYSICAL REVIEW LETTERS 2024; 132:113002. [PMID: 38563925 DOI: 10.1103/physrevlett.132.113002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Accepted: 01/25/2024] [Indexed: 04/04/2024]
Abstract
Saturated absorption measurements of transitions in the (2-0) band of radioactive tritium hydride are performed with the ultrasensitive noise-immune cavity-enhanced optical-heterodyne molecular spectroscopy intracavity absorption technique in the range 1460-1510 nm. The hyperfine structure of rovibrational transitions of tritium hydride, in contrast to that of hydrogen deuteride, exhibits a single isolated hyperfine component, allowing for the accurate determination of hyperfineless rovibrational transition frequencies, resulting in R(0)=203 396 426 692(22) kHz and R(1)=205 380 033 644(21) kHz. This corresponds to an accuracy 3 orders of magnitude better than previous measurements in tritiated hydrogen molecules. Observation of an isolated component in P(1) with reversed signal amplitude contradicts models for line shapes in hydrogen deuteride based on crossover resonances.
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Affiliation(s)
- F M J Cozijn
- Department of Physics and Astronomy, LaserLab, Vrije Universiteit De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - M L Diouf
- Department of Physics and Astronomy, LaserLab, Vrije Universiteit De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - W Ubachs
- Department of Physics and Astronomy, LaserLab, Vrije Universiteit De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - V Hermann
- Tritium Laboratory Karlsruhe, Institute of Astroparticle Physics, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - M Schlösser
- Tritium Laboratory Karlsruhe, Institute of Astroparticle Physics, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
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3
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Kassi S, Fleurbaey H, Campargue A. First detection and absolute transition frequencies in the (3-0) band of D2. J Chem Phys 2024; 160:094306. [PMID: 38445740 DOI: 10.1063/5.0196903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Accepted: 02/16/2024] [Indexed: 03/07/2024] Open
Abstract
Three electric quadrupole transitions in the second overtone band of D2 are newly measured by comb-referenced cavity ring down spectroscopy around 1.18 µm. These extremely weak transitions (line intensities smaller than 10-29 cm/molecule) are the first to be detected in the (3-0) band of D2. The spectra of the O(3), O(2), and Q(2) lines near 8321, 8446, and 8607 cm-1, respectively, are recorded at room temperature for pressure values ranging between 100 and 600 Torr. Accurate transition frequencies and line intensities of the three D2 transitions are determined from a line fitting procedure using beyond-Voigt profiles, including strong Dicke narrowing. Considering statistical fit errors and possible biases due to the interference with water lines (which are six orders of magnitude stronger than the studied D2 lines), total uncertainties on the frequencies extrapolated at zero pressure are estimated below 14 MHz (∼4.7 × 10-4 cm-1). The derived experimental frequencies and intensities are compared to ab initio values. An overall agreement is achieved, confirming the positional accuracy of the most advanced theoretical calculations.
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Affiliation(s)
- S Kassi
- University Grenoble Alpes, CNRS, LIPhy, 38000 Grenoble, France
| | - H Fleurbaey
- University Grenoble Alpes, CNRS, LIPhy, 38000 Grenoble, France
| | - A Campargue
- University Grenoble Alpes, CNRS, LIPhy, 38000 Grenoble, France
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4
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Stachowiak M, Grabowska E, Wang XG, Carrington T, Szalewicz K, Jankowski P. Theory cracks old data: Rovibrational energy levels of orthoH 2-CO derived from experiment. SCIENCE ADVANCES 2024; 10:eadj8632. [PMID: 38394212 PMCID: PMC10889352 DOI: 10.1126/sciadv.adj8632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Accepted: 01/22/2024] [Indexed: 02/25/2024]
Abstract
Measurements of rovibrational spectra of clusters provide physical insight only if spectral lines can be assigned to pairs of quantum states, and further insight is obtained if one can deduce the quantitative energy-level pattern. Both steps can be so difficult that some measured spectra remain unassigned, one example is orthoH2-CO. To extend the scope of spectroscopic insights, we propose to use theoretical information in interpretation of spectra. We first performed high accuracy, full-dimensional calculations of the orthoH2-CO spectrum, at the highest practically achievable levels of electronic structure theory and quantum nuclear dynamics. Then, an iterative, theory-guided method developed here allowed us to fully interpret the spectrum of orthoH2-CO, extending the range of van der Waals clusters for which spectroscopy can provide physical insights.
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Affiliation(s)
- Marcin Stachowiak
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Gagarina 7, 87-100 Toruń, Poland
| | - Ewelina Grabowska
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Gagarina 7, 87-100 Toruń, Poland
| | - Xiao-Gang Wang
- Chemistry Department, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - Tucker Carrington
- Chemistry Department, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - Krzysztof Szalewicz
- Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA
| | - Piotr Jankowski
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Gagarina 7, 87-100 Toruń, Poland
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5
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Martin-Sanchez D, Li J, Zhang EZ, Beard PC, Guggenheim JA. ABCD transfer matrix model of Gaussian beam propagation in plano-concave optical microresonators. OPTICS EXPRESS 2023; 31:16523-16534. [PMID: 37157729 PMCID: PMC11146662 DOI: 10.1364/oe.484212] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 03/09/2023] [Accepted: 04/24/2023] [Indexed: 05/10/2023]
Abstract
Plano-concave optical microresonators (PCMRs) are optical microcavities formed of one planar and one concave mirror separated by a spacer. PCMRs illuminated by Gaussian laser beams are used as sensors and filters in fields including quantum electrodynamics, temperature sensing, and photoacoustic imaging. To predict characteristics such as the sensitivity of PCMRs, a model of Gaussian beam propagation through PCMRs based on the ABCD matrix method was developed. To validate the model, interferometer transfer functions (ITFs) calculated for a range of PCMRs and beams were compared to experimental measurements. A good agreement was observed, suggesting the model is valid. It could therefore constitute a useful tool for designing and evaluating PCMR systems in various fields. The computer code implementing the model has been made available online.
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Affiliation(s)
- David Martin-Sanchez
- Department of Medical Physics and Biomedical Engineering, University College London, UK
| | - Jing Li
- Department of Medical Physics and Biomedical Engineering, University College London, UK
| | - Edward Z. Zhang
- Department of Medical Physics and Biomedical Engineering, University College London, UK
- Wellcome / EPSRC Centre for Interventional and Surgical Sciences, University College London, UK
| | - Paul C. Beard
- Department of Medical Physics and Biomedical Engineering, University College London, UK
- Wellcome / EPSRC Centre for Interventional and Surgical Sciences, University College London, UK
| | - James A. Guggenheim
- Department of Medical Physics and Biomedical Engineering, University College London, UK
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, UK
- School of Engineering, College of Engineering and Physical Sciences, University of Birmingham, UK
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6
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Lamperti M, Rutkowski L, Gatti D, Gotti R, Moretti L, Polli D, Cerullo G, Marangoni M. A stimulated Raman loss spectrometer for metrological studies of quadrupole lines of hydrogen isotopologues. Mol Phys 2023. [DOI: 10.1080/00268976.2023.2196353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/08/2023]
Affiliation(s)
- Marco Lamperti
- Dipartimento di Fisica - Politecnico di Milano and IFN-CNR, Lecco, Italy
| | - Lucile Rutkowski
- Univ Rennes, CNRS, IPR (Institut de Physique de Rennes)-UMR 6251, Rennes, France
| | - Davide Gatti
- Dipartimento di Fisica - Politecnico di Milano and IFN-CNR, Lecco, Italy
| | - Riccardo Gotti
- Dipartimento di Fisica - Politecnico di Milano and IFN-CNR, Lecco, Italy
| | - Luca Moretti
- Dipartimento di Fisica - Politecnico di Milano and IFN-CNR, Lecco, Italy
| | - Dario Polli
- Dipartimento di Fisica - Politecnico di Milano and IFN-CNR, Lecco, Italy
| | - Giulio Cerullo
- Dipartimento di Fisica - Politecnico di Milano and IFN-CNR, Lecco, Italy
| | - Marco Marangoni
- Dipartimento di Fisica - Politecnico di Milano and IFN-CNR, Lecco, Italy
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7
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Słowiński M, Makowski M, Sołtys KL, Stankiewicz K, Wójtewicz S, Lisak D, Piwiński M, Wcisło P. Cryogenic mirror position actuator for spectroscopic applications. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:115003. [PMID: 36461519 DOI: 10.1063/5.0116691] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 09/30/2022] [Indexed: 06/17/2023]
Abstract
We demonstrate a mirror position actuator that operates in a wide temperature range from room temperature to a deep cryogenic regime (10 K). We use a Michelson interferometer to measure the actuator tuning range (and piezoelectric efficiency) in the full temperature range. We demonstrate an unprecedented range of tunability of the mirror position in the cryogenic regime (over 22 μm at 10 K). The capability of controlling the mirror position in the range from few to few tens of microns is crucial for cavity-enhanced molecular spectroscopy techniques, especially in the important mid-infrared spectral regime where the length of an optical cavity has to be tunable in a range larger than the laser wavelength. The piezoelectric actuator offering this range of tunability in the cryogenic conditions, on the one hand, will enable development of optical cavities operating at low temperatures that are crucial for spectroscopy of large molecules whose dense spectra are difficult to resolve at room temperature. On the other hand, this will enable us to increase the accuracy of the measurement of simple molecules aimed at fundamental studies.
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Affiliation(s)
- Michał Słowiński
- Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, Grudziądzka 5, 87-100 Toruń, Poland
| | - Marcin Makowski
- Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, Grudziądzka 5, 87-100 Toruń, Poland
| | - Kamil Leon Sołtys
- Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, Grudziądzka 5, 87-100 Toruń, Poland
| | - Kamil Stankiewicz
- Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, Grudziądzka 5, 87-100 Toruń, Poland
| | - Szymon Wójtewicz
- Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, Grudziądzka 5, 87-100 Toruń, Poland
| | - Daniel Lisak
- Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, Grudziądzka 5, 87-100 Toruń, Poland
| | - Mariusz Piwiński
- Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, Grudziądzka 5, 87-100 Toruń, Poland
| | - Piotr Wcisło
- Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, Grudziądzka 5, 87-100 Toruń, Poland
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8
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Magic wavelength for a rovibrational transition in molecular hydrogen. Sci Rep 2022; 12:14529. [PMID: 36008440 PMCID: PMC9411631 DOI: 10.1038/s41598-022-18159-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Accepted: 08/05/2022] [Indexed: 11/11/2022] Open
Abstract
Molecular hydrogen, among other simple calculable atomic and molecular systems, possesses a huge advantage of having a set of ultralong living rovibrational states that make it well suited for studying fundamental physics. Further experimental progress will require trapping cold H2 samples. However, due to the large energy of the first electronic excitation, the conventional approach to finding a magic wavelength does not work for H2. We find a rovibrational transition for which the AC Stark shift is largely compensated by the interplay between the isotropic and anisotropic components of polarizability. The residual AC Stark shift can be completely eliminated by tuning the trapping laser to a specific “magic wavelength” at which the weak quadrupole polarizability cancels the residual dipole polarizability.
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9
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Dubroeucq R, Rutkowski L. Optical frequency comb Fourier transform cavity ring-down spectroscopy. OPTICS EXPRESS 2022; 30:13594-13602. [PMID: 35472969 DOI: 10.1364/oe.454775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Accepted: 03/28/2022] [Indexed: 06/14/2023]
Abstract
We demonstrate broadband and sensitive cavity ring-down spectroscopy using a near infrared frequency comb and a time-resolved Fourier transform spectrometer. The cavity decays are measured simultaneously at each optical path difference and spectrally sorted, leading to purely exponential decays for each spectral element. The absorption spectra of atmospheric water and carbon dioxide are retrieved and demonstrate the high frequency resolution and absorption precision of the technique. The experimental apparatus, the measurement concept and the data treatment are described. The technique benefits from the advantages of cavity ring-down spectroscopy, i.e. the retrieved absorption does not depend on the cavity parameters, opening up for high accuracy absorption spectroscopy entirely calibration-free.
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10
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Domysławska J, Wójtewicz S, Bielska K, Bilicki S, Ciuryło R, Lisak D. Line mixing in the oxygen B band head. J Chem Phys 2022; 156:084301. [DOI: 10.1063/5.0079158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present the results of direct measurements of the line mixing parameters for two pairs of overlapping transitions at the band head of the oxygen B band. Measurements were performed with the frequency-stabilized cavity ring-down spectrometer assisted by an optical frequency comb. The recorded spectra were analyzed with line profiles comprising speed dependence, Dicke narrowing, and line mixing. Incorporation of the line mixing into the model eliminated previous discrepancies for pressure shift and their speed dependence coefficients. First-order line mixing was determined directly from the line shape fitting at relatively low pressure (0.04 atm) together with other line shape parameters and compared with that calculated by Sung et al. [J. Quant. Spectrosc. Radiat. Transfer 235, 232–243 (2019)].
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Affiliation(s)
- Jolanta Domysławska
- Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, Grudziądzka 5, 87-100 Toruń, Poland
| | - Szymon Wójtewicz
- Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, Grudziądzka 5, 87-100 Toruń, Poland
| | - Katarzyna Bielska
- Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, Grudziądzka 5, 87-100 Toruń, Poland
| | - Sławomir Bilicki
- Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, Grudziądzka 5, 87-100 Toruń, Poland
| | - Roman Ciuryło
- Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, Grudziądzka 5, 87-100 Toruń, Poland
| | - Daniel Lisak
- Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, Grudziądzka 5, 87-100 Toruń, Poland
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11
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Pachucki K, Komasa J. Nonrelativistic energy of tritium-containing hydrogen molecule isotopologues. Mol Phys 2022. [DOI: 10.1080/00268976.2022.2040627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
| | - Jacek Komasa
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, Poznań, Poland
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12
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Bielska K, Cygan A, Konefał M, Kowzan G, Zaborowski M, Charczun D, Wójtewicz S, Wcisło P, Masłowski P, Ciuryło R, Lisak D. Frequency-based dispersion Lamb-dip spectroscopy in a high finesse optical cavity. OPTICS EXPRESS 2021; 29:39449-39460. [PMID: 34809309 DOI: 10.1364/oe.443661] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Accepted: 10/27/2021] [Indexed: 06/13/2023]
Abstract
Frequency-based cavity mode-dispersion spectroscopy (CMDS), previously applied for Doppler-limited molecular spectroscopy, is now employed for the first time for saturation spectroscopy. Comparison with two intensity-based, cavity-enhanced absorption spectroscopy techniques, i.e. cavity mode-width spectroscopy (CMWS) and the well-established cavity ring-down spectroscopy (CRDS), shows the predominance of the CMDS. The method enables measurements in broader pressure range and shows high immunity of the Lamb dip position to the incomplete model of saturated cavity mode shape. Frequencies of transitions from the second overtone of CO are determined with standard uncertainty below 500 Hz which corresponds to relative uncertainty below 3 × 10-12. The pressure shift of the Lamb dips, which has not been detected for these transitions in available literature data, is observed.
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13
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Affiliation(s)
- Arthur Fast
- Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Samuel A. Meek
- Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
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14
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Tian J, Zhao G, Fleisher AJ, Ma W, Jia S. Optical feedback linear cavity enhanced absorption spectroscopy. OPTICS EXPRESS 2021; 29:26831-26840. [PMID: 34615110 PMCID: PMC9983294 DOI: 10.1364/oe.431934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Accepted: 07/27/2021] [Indexed: 06/13/2023]
Abstract
A simple and universal technique for performing optical feedback cavity enhanced absorption spectroscopy with a linear Fabry-Pérot cavity is presented. We demonstrate through both theoretical analysis and experiment that a diode laser can be sequentially stabilized to a series of cavity modes without any influence from the direct reflection if the feedback phase is appropriately controlled. With robust handling of the feedback phase and help from balanced detection, a detection limit of 1.3 × 10-9 cm-1 was achieved in an integration time of 30 s. The spectrometer performance enabled precision monitoring of atmospheric methane (CH4) concentrations over a time period of 72 h.
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Affiliation(s)
- Jianfei Tian
- State Key Laboratory of Quantum Optics & Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, 030006 Taiyuan, China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, 030006 Taiyuan, China
| | - Gang Zhao
- State Key Laboratory of Quantum Optics & Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, 030006 Taiyuan, China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, 030006 Taiyuan, China
| | - Adam J. Fleisher
- Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
| | - Weiguang Ma
- State Key Laboratory of Quantum Optics & Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, 030006 Taiyuan, China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, 030006 Taiyuan, China
| | - Suotang Jia
- State Key Laboratory of Quantum Optics & Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, 030006 Taiyuan, China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, 030006 Taiyuan, China
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15
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Santamaria L, Di Sarno V, Aiello R, De Rosa M, Ricciardi I, De Natale P, Maddaloni P. Infrared Comb Spectroscopy of Buffer-Gas-Cooled Molecules: Toward Absolute Frequency Metrology of Cold Acetylene. Int J Mol Sci 2020; 22:E250. [PMID: 33383699 PMCID: PMC7795711 DOI: 10.3390/ijms22010250] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 12/18/2020] [Accepted: 12/24/2020] [Indexed: 11/20/2022] Open
Abstract
We review the recent developments in precision ro-vibrational spectroscopy of buffer-gas-cooled neutral molecules, obtained using infrared frequency combs either as direct probe sources or as ultra-accurate optical rulers. In particular, we show how coherent broadband spectroscopy of complex molecules especially benefits from drastic simplification of the spectra brought about by cooling of internal temperatures. Moreover, cooling the translational motion allows longer light-molecule interaction times and hence reduced transit-time broadening effects, crucial for high-precision spectroscopy on simple molecules. In this respect, we report on the progress of absolute frequency metrology experiments with buffer-gas-cooled molecules, focusing on the advanced technologies that led to record measurements with acetylene. Finally, we briefly discuss the prospects for further improving the ultimate accuracy of the spectroscopic frequency measurement.
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Affiliation(s)
- Luigi Santamaria
- Agenzia Spaziale Italiana, Contrada Terlecchia, 75100 Matera, Italy;
| | - Valentina Di Sarno
- Consiglio Nazionale delle Ricerche-Istituto Nazionale di Ottica, Via Campi Flegrei 34, 80078 Pozzuoli, Italy; (V.D.S.); (R.A.); (M.D.R.); (I.R.)
- Istituto Nazionale di Fisica Nucleare, Sez. di Napoli, Complesso Universitario di M.S. Angelo, Via Cintia, 80126 Napoli, Italy
| | - Roberto Aiello
- Consiglio Nazionale delle Ricerche-Istituto Nazionale di Ottica, Via Campi Flegrei 34, 80078 Pozzuoli, Italy; (V.D.S.); (R.A.); (M.D.R.); (I.R.)
- Istituto Nazionale di Fisica Nucleare, Sez. di Napoli, Complesso Universitario di M.S. Angelo, Via Cintia, 80126 Napoli, Italy
| | - Maurizio De Rosa
- Consiglio Nazionale delle Ricerche-Istituto Nazionale di Ottica, Via Campi Flegrei 34, 80078 Pozzuoli, Italy; (V.D.S.); (R.A.); (M.D.R.); (I.R.)
- Istituto Nazionale di Fisica Nucleare, Sez. di Napoli, Complesso Universitario di M.S. Angelo, Via Cintia, 80126 Napoli, Italy
| | - Iolanda Ricciardi
- Consiglio Nazionale delle Ricerche-Istituto Nazionale di Ottica, Via Campi Flegrei 34, 80078 Pozzuoli, Italy; (V.D.S.); (R.A.); (M.D.R.); (I.R.)
- Istituto Nazionale di Fisica Nucleare, Sez. di Napoli, Complesso Universitario di M.S. Angelo, Via Cintia, 80126 Napoli, Italy
| | - Paolo De Natale
- Consiglio Nazionale delle Ricerche-Istituto Nazionale di Ottica, Largo E. Fermi 6, 50125 Firenze, Italy;
- Istituto Nazionale di Fisica Nucleare, Sez. di Firenze, Via G. Sansone 1, 50019 Sesto Fiorentino, Italy
| | - Pasquale Maddaloni
- Consiglio Nazionale delle Ricerche-Istituto Nazionale di Ottica, Via Campi Flegrei 34, 80078 Pozzuoli, Italy; (V.D.S.); (R.A.); (M.D.R.); (I.R.)
- Istituto Nazionale di Fisica Nucleare, Sez. di Napoli, Complesso Universitario di M.S. Angelo, Via Cintia, 80126 Napoli, Italy
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16
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Maity A, Maithani S, Pradhan M. Cavity Ring-Down Spectroscopy: Recent Technological Advancements, Techniques, and Applications. Anal Chem 2020; 93:388-416. [DOI: 10.1021/acs.analchem.0c04329] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Abhijit Maity
- Department of Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Salt Lake, JD Block, Sector III, Kolkata 700106, India
- Technical Research Centre, S. N. Bose National Centre for Basic Sciences, Salt Lake, JD Block, Sector III, Kolkata 700106, India
| | - Sanchi Maithani
- Department of Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Salt Lake, JD Block, Sector III, Kolkata 700106, India
| | - Manik Pradhan
- Department of Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Salt Lake, JD Block, Sector III, Kolkata 700106, India
- Technical Research Centre, S. N. Bose National Centre for Basic Sciences, Salt Lake, JD Block, Sector III, Kolkata 700106, India
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17
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Fast A, Meek SA. Sub-ppb Measurement of a Fundamental Band Rovibrational Transition in HD. PHYSICAL REVIEW LETTERS 2020; 125:023001. [PMID: 32701331 DOI: 10.1103/physrevlett.125.023001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Accepted: 06/01/2020] [Indexed: 06/11/2023]
Abstract
We report a direct measurement of the 1-0 R(0) vibrational transition frequency in ground-state hydrogen deuteride (HD) using infrared-ultraviolet double resonance spectroscopy in a molecular beam. Ground-state molecules are vibrationally excited using a frequency comb referenced continuous-wave infrared laser, and the excited molecules are detected via state-selective ionization with a pulsed ultraviolet laser. We determine an absolute transition frequency of 111 448 815 477(13) kHz. The 0.12 parts-per-billion (ppb) uncertainty is limited primarily by the residual first-order Doppler shift.
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Affiliation(s)
- Arthur Fast
- Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
| | - Samuel A Meek
- Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
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