J/A+A/622/A127 H2/HD molecular data for quasar spectra analysis (Ubachs+, 2019)
H2/HD molecular data for analysis of quasar spectra in search of
varying constants.
Ubachs W., Salumbides E.J., Murphy M.T., Abgrall H., Roueff E.
<Astron. Astrophys. 622, A127 (2019)>
=2019A&A...622A.127U 2019A&A...622A.127U (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics
Keywords: molecular data
Abstract:
Absorption lines of H2 and HD molecules observed at high redshift in
the line of sight towards quasars are a test ground to search for
variation of the proton-to-electron mass ratio µ. For this purpose
results from astronomical observations are compared with a compilation
of molecular data of the highest accuracy, obtained in laboratory
studies as well as in first principles calculations.
A comprehensive line list is compiled for H2 and HD absorption lines
in the Lyman (B1Σ+u-X1Σ+g) and Werner
(C1Πu-X1Σ+g) bands systems up to the Lyman cutoff
at 912Å. Molecular parameters listed for each line i are the
transition wavelength λi, the line oscillator strength fi,
the radiative damping parameter of the excited state Γ_i, and
the sensitivity coefficient Ki for a variation of the
proton-to-electron mass ratio.
The transition wavelengths λi for the H2 and HD molecules
are determined by a variety of advanced high-precision spectroscopic
experiments involving narrowband vacuum ultraviolet lasers,
Fourier-transform spectrometers and synchrotron radiation sources.
Results for the line oscillator strengths fi, damping parameters
Γi and sensitivity coefficients Ki are obtained in
theoretical quantum chemical calculations.
A new list of molecular data is compiled for future analyses of cold
clouds of hydrogen absorbers, specifically for studies of
µ-variation from quasar data. The list is applied in a refit of
quasar absorption spectra of B0642-5038 and J1237+0647 yielding
constraints on a variation of the proton-to-electron mass ratio
Δµ/µ consistent with previous analyses.
Description:
Catalogue of the most accurate and precise laboratory parameters for
fitting molecular hydrogen (H2 and HD) absorptions lines. Indicated
in table 1 are all allowed Lyman H2 transitions between the lowest 8
rotational levels in the ground and excited states with excited state
vibrational quantum num- bers up to v'=19. Listed in table 2 are
allowed Werner H2 transitions bet- ween the lowest 8 rotational levels
in the ground and excited states with excited state vibrational
quantum numbers up to v'=5. Table 3 lists allowed Lyman and Werner HD
transitions between the lowest 2 rotational levels in the ground and
excited states with excited state vibrational quantum numbers up to 21
for Lyman transitions and up to 5 for Werner transitions,
respectively.
The first column provides a short-hand notation for the transition:
letters denote a Lyman (L) or Werner (W) line and the branch, where P,
Q and R represent (J'-J)=-1, 0 and 1, respectively, for J and J'
the ground state and excited state levels, respectively; the first
integer is the excited state vibrational quantum number v' and the
second is J.
The second column gives the most precise reported laboratory
wavelength (lambda) and its 1-sigma uncertainty (dlambda) is given
in the third column (both second and third columns in units of
Angstroms).
The fourth column provides the reference (Ref) for the listed
wavelengths and uncertainties
The fifth column gives the oscillator strengths (f): for H2 these
were calculated from the Einstein A coefficients given by Abgrall,
Roueff, Launay, Roncin (1994, Can. J. Phys., 72, 856), while for HD
these were calculated from the Einstein A coefficients given by
Abgrall & Roueff (2006A&A...445..361A 2006A&A...445..361A, cat. J/A+A/445/361).
The sixth column gives the (natural) damping coefficients (Gamma) in
units of seconds-1: the H2 values were calculated from the total
transition probabilities (A_t) in Abgrall, Roueff, Drira
(2000A&AS..141..297A 2000A&AS..141..297A, Cat. J/A+AS/141/297), while the HD values were
calculated from the total transition probabilities in Abgrall &
Roueff (2006A&A...445..361A 2006A&A...445..361A, cat. J/A+A/445/361).
The final column gives the sensitivity coefficients (K): the H2
values were calculated in Salumbides, Bagdonaite, Abgrall, Roueff,
Ubachs (2015MNRAS.450.1237S 2015MNRAS.450.1237S), while the HD values were from Ivanov,
Dickenson, Roudjane, de Oliveira, Joyeux, Nahon, Tchang-Brillet,
Ubachs (2010, Mol. Phys. 108, 771). The sensitivity coefficients have
estimated un- certainties of typically <5x10-4.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 58 300 H2 data for Lyman (B-X) transitions
table2.dat 58 126 H2 data for Werner (C-X) transitions
table3.dat 58 84 HD data for Lyman and Werner transitions
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See also:
J/A+AS/141/297 : H2 total transition probability (Abgrall+, 2000)
J/A+A/445/361 : HD total transition probability (Abgrall+Roueff, 2006)
Byte-by-byte Description of file: table1.dat table2.dat table3.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Trans Line label (1)
7- 17 F11.6 A lambda Laboratory wavelength
19- 26 F8.6 A e_lambda Uncertainty in laboratory wavelength
28- 29 A2 --- r_lambda Reference for wavelength (2)
31- 39 E9.3 --- f Oscillator strength
41- 49 E9.3 s-1 Gamma Natural damping coefficient
51- 58 F8.5 --- K Sensitivity coefficient
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Note (1): letters denote a Lyman (L) or Werner (W) line and the branch, where P,
Q and R represent (J'-J)=-1, 0 and 1, respectively, for J and J' the ground
state and excited state levels, respectively; the first integer is the
excited state vibrational quantum number v' and the second is J.
Note (2): Wavelength references as follows:
1 = Bailly, Salumbides, Vervloet, Ubachs (2009, Mol. Phys. 108, 827-846)
for the excited state energy levels; with ground states from Komasa et
al. (2011, J. Chem. Theory Comput. 7, 10, 3105-3115).
2a = Ubachs, Buning, Eikema, Reinhold (2007, J. Mol. Spectrosc., 241, 155)
for the excited state energy levels; with ground states from Komasa et
al. (2011, J. Chem. Theory Comput. 7, 10, 3105-3115).
Directly measured wavelengths.
2b = Ubachs, Buning, Eikema, Reinhold (2007, J. Mol. Spectrosc., 241, 155)
for the excited state energy levels; with ground states from Komasa et
al. (2011, J. Chem. Theory Comput. 7, 10, 3105-3115).
Wavelengths calculated from directly measured lines via combination
differences.
3 = Abgrall, Roueff, Launay, Roncin, Subtil (1993, J. Mol. Spectrosc.157,
512) for the excited state energy levels; with ground states from
Dabrowski (1984, Can. J. Phys. 62, 1639-1664)
The wavelengths with reference 3 are much less precise than those with
references 1 and 2.
4 = Ivanov, T. I., Roudjane, M., Vieitez, M. O., de Lange, C. A.,
Tchang-Brillet,W.-U. L. & Ubachs, W.
(2008, Phys. Rev. Lett. 100, 093007).
5 = Hinnen, P. C., Werners, S. E., Stolte, S., Hogervorst, W.
& Ubachs, W. (1995, Phys. Rev. A 52, 4425).
6 = Ivanov, T. I., Dickenson, G. D., Roudjane, M., de Oliveira, N.,
Joyeux, D., Nahon, L. Tchang-Brillet, W.-U. L. & Ubachs, W.
(2010, Mol. Phys. 108, 771).
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Acknowledgements:
Wim Ubachs, e.j.salumbides(at)vu.nl
(End) Wim Ubachs [Netherlands], Patricia Vannier [CDS] 11-Jan-2019