1
|
Huang X, Schwenke DW, Freedman RS, Lee TJ. Ames-2021 CO 2 Dipole Moment Surface and IR Line Lists: Toward 0.1% Uncertainty for CO 2 IR Intensities. J Phys Chem A 2022; 126:5940-5964. [PMID: 36007245 DOI: 10.1021/acs.jpca.2c01291] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A highly accurate CO2 ab initio dipole moment surface (DMS), Ames-2021, is reported along with 12C16O2 infrared (IR) intensity comparisons approaching a 1-4‰ level of agreement and uncertainty. The Ames-2021 DMS was accurately fitted from CCSD(T) finite-field dipoles computed with the aug-cc-pVXZ (X = T, Q, 5) basis for C atom and the d-aug-cc-pVXZ (X = T, Q, 5) basis for O atoms, and extrapolated to the one particle basis set limit. Fitting σrms is 3.8 × 10-7 au for 4443 geometries below 15 000 cm-1. The corresponding IR intensity, SAmes-2021, are computed using the Ames-2 potential energy surface (PES), which is the best PES available for CO2. Compared to high accuracy IR studies for 2001i-00001 and 3001i-00001 bands, SAmes-2021 matches NIST experiment-based intensities [SNIST-HIT16 or SHIT20] to -1.0 ± 1.3‰, or matches DLR experiment-based intensities [SDLR-HIT16/UCL/Ames] to 1.9 ± 3.7‰. This indicates the systematic deviations and uncertainties have been significantly reduced in SAmes-2021. The SUCL2015 (or SHITRAN2016) have larger deviations (vs SDLR) and uncertainties (vs SDLR, SNIST) which are attributed to the less accurate Ames-1 PES adopted in UCL-296 line list calculation. The SAmes-2021 intensity of 12C16O2 and 13C16O2 is utilized to derive new absolute 13C/12C ratios for Vienna PeeDee Belemnite (VPDB) with uncertainty reduced by 1/3 or 2/3. Further evaluation of SAmes-2021 intensities are carried out on those CO2 bands discussed in the HITRAN2020 update paper. Consistent improvements and better accuracies are found in band-by-band analysis, except for those bands strongly affected by Coriolis couplings, or very weak bands measured with relatively larger experimental uncertainties. The Ames-2021 296 K IR line lists are generated for 13 CO2 isotopologues, with 18 000 cm-1 and S296 K > 1 × 10-31 cm/molecule cutoff and then combined with CDSD line positions (except 14C16O2). The Ames-2021 DMS and 296 K IR line lists represent a major improvement over previous CO2 theoretical IR intensity studies, including Ames-2016, UCL-296, and recent UCL DMS 2021 update. A real 1 permille level of agreement and uncertainty will definitely require both more accurate PES and more accurate DMS.
Collapse
Affiliation(s)
- Xinchuan Huang
- MS 245-6, Astrophysics Branch, Space Science and Astrobiology Division, NASA Ames Research Center, Moffett Field, California 94035, United States.,SETI Institute, 339 Bernardo Avenue, Suite 200, Mountain View, California 94043, United States
| | - David W Schwenke
- MS 258-2, NAS Facility, NASA Ames Research Center, Moffett Field, California 94035, United States
| | - Richard S Freedman
- SETI Institute, 339 Bernardo Avenue, Suite 200, Mountain View, California 94043, United States.,MS 245-3, Planetary Systems Branch, Space Science and Astrobiology Division, NASA Ames Research Center, Moffett Field, California 94035, United States
| | - Timothy J Lee
- MS 245-3, Planetary Systems Branch, Space Science and Astrobiology Division, NASA Ames Research Center, Moffett Field, California 94035, United States
| |
Collapse
|
2
|
Yachmenev A, Campargue A, Yurchenko SN, Küpper J, Tennyson J. Electric quadrupole transitions in carbon dioxide. J Chem Phys 2021; 154:211104. [PMID: 34240963 DOI: 10.1063/5.0053279] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Recent advances in high sensitivity spectroscopy have made it possible, in combination with accurate theoretical predictions, to observe, for the first time, very weak electric quadrupole transitions in a polar polyatomic molecule of water. Here, we present accurate theoretical predictions of the complete quadrupole rovibrational spectrum of a non-polar molecule CO2, important in atmospheric and astrophysical applications. Our predictions are validated by recent cavity enhanced absorption spectroscopy measurements and are used to assign few weak features in the recent ExoMars Atmospheric Chemistry Suite mid-infrared spectroscopic observations of the Martian atmosphere. Predicted quadrupole transitions appear in some of the mid-infrared CO2 and water vapor transparency regions, making them important for detection and characterization of the minor absorbers in water- and CO2-rich environments, such as those present in the atmospheres of Earth, Venus, and Mars.
Collapse
Affiliation(s)
- Andrey Yachmenev
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | | | - Sergei N Yurchenko
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - Jochen Küpper
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Jonathan Tennyson
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| |
Collapse
|
3
|
Wu H, Hu CL, Wang J, Sun YR, Tan Y, Liu AW, Hu SM. A well-isolated vibrational state of CO2verified by near-infrared saturated spectroscopy with kHz accuracy. Phys Chem Chem Phys 2020; 22:2841-2848. [DOI: 10.1039/c9cp05121j] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Quantitative determination of atmospheric CO2concentration by remote sensing relies on accurate line parameters.
Collapse
Affiliation(s)
- Hao Wu
- Hefei National Laboratory for Physical Sciences at Microscale
- iChem Center
- University of Science and Technology of China
- Hefei
- China
| | - Chang-Le Hu
- Hefei National Laboratory for Physical Sciences at Microscale
- iChem Center
- University of Science and Technology of China
- Hefei
- China
| | - Jin Wang
- Hefei National Laboratory for Physical Sciences at Microscale
- iChem Center
- University of Science and Technology of China
- Hefei
- China
| | - Yu R. Sun
- Hefei National Laboratory for Physical Sciences at Microscale
- iChem Center
- University of Science and Technology of China
- Hefei
- China
| | - Yan Tan
- Hefei National Laboratory for Physical Sciences at Microscale
- iChem Center
- University of Science and Technology of China
- Hefei
- China
| | - An-Wen Liu
- Hefei National Laboratory for Physical Sciences at Microscale
- iChem Center
- University of Science and Technology of China
- Hefei
- China
| | - Shui-Ming Hu
- Hefei National Laboratory for Physical Sciences at Microscale
- iChem Center
- University of Science and Technology of China
- Hefei
- China
| |
Collapse
|
4
|
Fleurbaey H, Yi H, Adkins EM, Fleisher AJ, Hodges JT. Cavity ring-down spectroscopy of CO 2 near λ = 2.06 μm: Accurate transition intensities for the Orbiting Carbon Observatory-2 (OCO-2) "strong band". JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER 2020; 252:https://doi.org/10.1016/j.jqsrt.2020.107104. [PMID: 33100382 DOI: 10.1016/j.jqsrt.2020.107104] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The λ = 2.06 μm absorption band of CO2 is widely used for the remote sensing of atmospheric carbon dioxide, making it relevant to many important top-down measurements of carbon flux. The forward models used in the retrieval algorithms employed in these measurements require increasingly accurate line intensity and line shape data from which absorption cross-sections can be computed. To overcome accuracy limitations of existing line lists, we used frequency-stabilized cavity ring-down spectroscopy to measure 39 transitions in the 12C16O2 absorption band. The line intensities were measured with an estimated relative combined standard uncertainty of u r = 0.08 %. We predicted the J-dependence of the measured intensities using two theoretical models: a one-dimensional spectroscopic model with Herman-Wallis rotation-vibration corrections, and a line-by-line ab initio dipole moment surface model [Zak et al. JQSRT 2016;177:31-42]. For the second approach, we fit only a single factor to rescale the theoretical integrated band intensity to be consistent with the measured intensities. We find that the latter approach yields an equally adequate representation of the fitted J-dependent intensity data and provides the most physically general representation of the results. Our recommended value for the integrated band intensity equal to 7.183 × 10-21 cm molecule-1 ± 6 × 10-24 cm molecule-1 is based on the rescaled ab initio model and corresponds to a fitted scale factor of 1.0069 ± 0.0002. Comparisons of literature intensity values to our results reveal systematic deviations ranging from -1.16 % to +0.33 %.
Collapse
Affiliation(s)
- Hélène Fleurbaey
- Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
| | - Hongming Yi
- Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
| | - Erin M Adkins
- Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
| | - Adam J Fleisher
- Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
| | - Joseph T Hodges
- Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
| |
Collapse
|
5
|
Nguyen HT, Ngo NH, Tran H. Prediction of line shape parameters and their temperature dependences for CO 2-N 2 using molecular dynamics simulations. J Chem Phys 2018; 149:224301. [PMID: 30553246 DOI: 10.1063/1.5063892] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We show in this paper that requantized classical molecular dynamics simulations (rCMDSs) are capable of predicting various refined spectral-shape parameters of absorption lines of CO2 broadened by N2 with high precision. Combining CMDSs and a requantization procedure, we computed the auto-correlation function of the CO2 dipole moment responsible for the absorption transition. Its Fourier-Laplace transform directly yields the spectrum. Calculations were made for two temperatures, 200 and 296 K, at 1 atm and for a large range of Doppler widths, from the near-Doppler to the collision-dominant regimes. For each temperature and each line, the spectra calculated for various Doppler widths were simultaneously fit with the Hartmann-Tran (HT) profile. This refined profile, which takes into account the effects of the speed dependent collisional line broadening, the Dicke narrowing, and the collisional line mixing, was recommended as a reference model to be used in high-resolution spectroscopy (instead of the simplified Voigt model). The HT parameters retrieved from the rCMDS-calculated spectra were then directly compared with those deduced from high-precision measurements [J. S. Wilzewski et al., J. Quant. Spectrosc. Radiat. Transfer 206, 296-305 (2018)]. The results show a very good agreement, even for those parameters whose influence on the spectra is very small. Good agreement is also obtained between measured and predicted temperature dependences of these parameters. This demonstrates that rCMDS is an excellent tool, highly competitive with respect to high quality measurements for precise line-shape studies.
Collapse
Affiliation(s)
- H T Nguyen
- Faculty of Physics, Hanoi National University of Education, 136 Xuan Thuy, Cau Giay, Hanoi, Vietnam
| | - N H Ngo
- Faculty of Physics, Hanoi National University of Education, 136 Xuan Thuy, Cau Giay, Hanoi, Vietnam
| | - H Tran
- Laboratoire de Météorologie Dynamique, IPSL, CNRS, Sorbonne Université, École normale supérieure, PSL Research University, École Polytechnique, F-75005 Paris, France
| |
Collapse
|
6
|
Mizus II, Kyuberis AA, Zobov NF, Makhnev VY, Polyansky OL, Tennyson J. High-accuracy water potential energy surface for the calculation of infrared spectra. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2018; 376:rsta.2017.0149. [PMID: 29431677 PMCID: PMC5805917 DOI: 10.1098/rsta.2017.0149] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 11/30/2017] [Indexed: 05/06/2023]
Abstract
Transition intensities for small molecules such as water and CO2 can now be computed with such high accuracy that they are being used to systematically replace measurements in standard databases. These calculations use high-accuracy ab initio dipole moment surfaces and wave functions from spectroscopically determined potential energy surfaces (PESs). Here, an extra high-accuracy PES of the water molecule (H216O) is produced starting from an ab initio PES which is then refined to empirical rovibrational energy levels. Variational nuclear motion calculations using this PES reproduce the fitted energy levels with a standard deviation of 0.011 cm-1, approximately three times their stated uncertainty. The use of wave functions computed with this refined PES is found to improve the predicted transition intensities for selected (problematic) transitions. A new room temperature line list for H216O is presented. It is suggested that the associated set of line intensities is the most accurate available to date for this species.This article is part of the theme issue 'Modern theoretical chemistry'.
Collapse
Affiliation(s)
- Irina I Mizus
- Institute of Applied Physics, Russian Academy of Science, Ulyanov Street 46, Nizhny Novgorod 603950, Russia
| | - Aleksandra A Kyuberis
- Institute of Applied Physics, Russian Academy of Science, Ulyanov Street 46, Nizhny Novgorod 603950, Russia
| | - Nikolai F Zobov
- Institute of Applied Physics, Russian Academy of Science, Ulyanov Street 46, Nizhny Novgorod 603950, Russia
| | - Vladimir Yu Makhnev
- Institute of Applied Physics, Russian Academy of Science, Ulyanov Street 46, Nizhny Novgorod 603950, Russia
| | - Oleg L Polyansky
- Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
| | - Jonathan Tennyson
- Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
| |
Collapse
|
7
|
Yi H, Liu Q, Gameson L, Fleisher AJ, Hodges JT. High-accuracy 12C 16O 2 line intensities in the 2 μm wavelength region measured by frequency-stabilized cavity ring-down spectroscopy. JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER 2018; 206:367-377. [PMID: 29731521 PMCID: PMC5930389 DOI: 10.1016/j.jqsrt.2017.12.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Reported here are highly accurate, experimentally measured ro-vibrational transition intensities for the R-branch of the (20012) - (00001) 12C16O2 band near λ = 2 μm. Measurements were performed by a frequency-stabilized cavity ring-down spectroscopy (FS-CRDS) instrument designed to achieve precision molecular spectroscopy in this important region of the infrared. Through careful control and traceable characterization of CO2 sample conditions, and through high-fidelity measurements spanning several months in time, we achieve relative standard uncertainties for the reported transition intensities between 0.15 % and 0.46 %. Such high accuracy spectroscopy is shown to provide a stringent test of calculated potential energy and ab initio dipole moment surfaces, and therefore transition intensities calculated from first principles.
Collapse
|
8
|
Fleisher AJ, Long DA, Liu Q, Gameson L, Hodges JT. Optical Measurement of Radiocarbon below Unity Fraction Modern by Linear Absorption Spectroscopy. J Phys Chem Lett 2017; 8:4550-4556. [PMID: 28880564 PMCID: PMC5725230 DOI: 10.1021/acs.jpclett.7b02105] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
High-precision measurements of radiocarbon (14C) near or below a fraction modern 14C of 1 (F14C ≤ 1) are challenging and costly. An accurate, ultrasensitive linear absorption approach to detecting 14C would provide a simple and robust benchtop alternative to off-site accelerator mass spectrometry facilities. Here we report the quantitative measurement of 14C in gas-phase samples of CO2 with F14C < 1 using cavity ring-down spectroscopy in the linear absorption regime. Repeated analysis of CO2 derived from the combustion of either biogenic or petrogenic sources revealed a robust ability to differentiate samples with F14C < 1. With a combined uncertainty of 14C/12C = 130 fmol/mol (F14C = 0.11), initial performance of the calibration-free instrument is sufficient to investigate a variety of applications in radiocarbon measurement science including the study of biofuels and bioplastics, illicitly traded specimens, bomb dating, and atmospheric transport.
Collapse
|
9
|
Zak EJ, Tennyson J. Ro-vibronic transition intensities for triatomic molecules from the exact kinetic energy operator; electronic spectrum for the C̃ 1B 2 ← X̃ 1A 1 transition in SO 2. J Chem Phys 2017; 147:094305. [PMID: 28886637 DOI: 10.1063/1.4986943] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
A procedure for calculating ro-vibronic transition intensities for triatomic molecules within the Born-Oppenheimer approximation is reported. Ro-vibrational energy levels and wavefunctions are obtained with the DVR3D suite, which solves the nuclear motion problem with an exact kinetic energy operator. Absolute transition intensities are calculated both with the Franck-Condon approximation and with a full transition dipole moment surface. The theoretical scheme is tested on C̃ 1B2 ← X̃ 1A1 ro-vibronic transitions of SO2. Ab initio potential energy and dipole moment surfaces are generated for this purpose. The calculated ro-vibronic transition intensities and cross sections are compared with the available experimental and theoretical data.
Collapse
Affiliation(s)
- Emil J Zak
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - Jonathan Tennyson
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| |
Collapse
|