J/ApJ/859/19 A1Π-X1Σ+ transitions of CO study (Cheng+, 2018)
Spectral study of A1Π-X1Σ+ transitions of CO relevant to
interstellar clouds.
Cheng J., Zhang H., Cheng X.
<Astrophys. J., 859, 19 (2018)>
=2018ApJ...859...19C 2018ApJ...859...19C
ADC_Keywords: Carbon monoxide; Atomic physics; Molecular data
Keywords: ISM: molecules ; molecular data ; ultraviolet: ISM
Abstract:
Highly correlated ab initio calculations were performed for an
accurate determination of the A1Π-X1Σ+ system of the CO
molecule. A highly accurate multi-reference configuration interaction
approach was used to investigate the potential energy curves (PECs)
and the transition dipole moment curve (TDMC). The resultant PECs and
TDMC found by using the aug-cc-pV5Z (aV5Z) basis set and 5330 active
spaces are in good agreement with the experimental data. Moreover, the
Einstein A coefficients, lifetimes, ro-vibrational intensities,
absorption oscillator strengths, and integrated cross sections are
calculated so that the vibrational bands include v"=0-39 -> v'=0-23.
For applications in the atmosphere and interstellar clouds, we studied
the transition lineshapes to Gaussian and Lorentzian profiles at
different temperatures and pressures. The intensities were calculated
at high temperature that was used to satisfy some astrophysical
applications, such as in planetary atmospheres. The results are
potentially useful for important SAO/NASA Astrophysics Data System and
databases such as HITRAN, HITEMP, and the National Institute of
Standards and Technology. Because the results from many laboratory
techniques and our calculations now agree, analyses of interstellar CO
based on absorption from A1Π-X1Σ+ are no longer
hindered by present spectral parameters.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 77 16170 Spectral parameters of the linelist
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See also:
J/ApJS/95/535 : Infrared CO line list for X 1Σ+ state (Goorvitch, 1994)
Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- dJ(J1) Linelist; Branch (upper rotational
quantum number)
9- 16 F8.2 cm-1 Elow [1081.7/34837] Lower energy level
18- 27 F10.4 cm-1 E(2)-E(1) [49095/73045.6] Transition wavenumber
29- 36 E8.2 s-1 A [0.02/9.4e+06] Einstein coefficient
38- 40 I3 --- gu [3/223] Upper-state statistical weight
42- 44 I3 --- gl [1/221] Lower-state statistical weight
46- 50 A5 --- v0-v1 Transition band
52- 59 E8.2 --- I [1.5e-91/2.3e-16] Intensity at 296K;
cm-1/(molecule/cm2)
61- 68 E8.2 --- f [2.4e-11/0.02] Oscillator strength
70- 77 E8.2 --- sigma [7.3e-25/2.4e-16] Cross section; cm2 Angstrom
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 03-Apr-2019