On the a 1II-X1sigma+ Band System in CH+ and CD+: Theoretical Spectroscopic Constants and Lifetimes

Elander, Nils; Oddershede, Jens; Beebe, Nelson H. F.

doi:10.1086/155457

Cited by 35 publications

(17 citation statements)

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“…Our f -value for the CH + A− X (2, 0) transition at 3745 Å (172 × 10 −5 ) is close to that published previously by Elander et al (1977) and Yoshimine et al (1973) (170 and 173 × 10 −5 , respectively). The f -value of the CH + A − X (3, 0) transition at 3579 Å (75 × 10 −5 ) is higher than that published by Elander et al (1977), which equals 63 × 10 −5 ; based on theoretical calculations. However, it is difficult to compare our results with those published previously since no errors in the case of f -values of (1, 0), (2, 0), and (3, 0) A − X transition of CH + molecule were estimated in the previously published theoretical works.…”

Section: Resultssupporting

confidence: 90%

“…Our new f -value in the case of (1, 0) transition at 3957 Å is higher than that presented in Larsson & Siegbahn (1983). Our f -value for the CH + A− X (2, 0) transition at 3745 Å (172 × 10 −5 ) is close to that published previously by Elander et al (1977) and Yoshimine et al (1973) (170 and 173 × 10 −5 , respectively). The f -value of the CH + A − X (3, 0) transition at 3579 Å (75 × 10 −5 ) is higher than that published by Elander et al (1977), which equals 63 × 10 −5 ; based on theoretical calculations.…”

Section: Resultssupporting

confidence: 81%

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Observational test of the CH cation oscillator strengths

Weselak¹,

Галазутдинов²,

Мусаев³

et al. 2009

A&A

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We revise measurements of the positions and oscillator strengths using spectral features in the CH + A − X system, and by using high-resolution, echelle spectra of 36 stars and assuming that its wavelength and oscillator strength as given in the literature for the (0, 0) transition, i.e. 4232.548 Å and 0.00545 respectively, are correct. The recommended oscillator strengths of the lines at 3957.689, 3745.308, 3579.024, and 3447.077 Å are found to be (in units of 10 −5 ) 342, 172, 75, and 40, respectively. The estimated column densities of the CH cation toward the observed targets are also presented.

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 81%

Observational test of the CH cation oscillator strengths

Weselak¹,

Галазутдинов²,

Мусаев³

et al. 2009

A&A

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“…Refs. 29,30). In contrast to this, careful electron scattering experiments [29,31] yield notably higher values of the oscillator strengths.…”

Section: The a Lli-x 1z+ Systemmentioning

confidence: 79%

Correlation between perturbation and collisional transfers in theA, B, C andb states of CO as revealed by high resolution lifetime measurements

Carlson¹,

Duric

Erman³

et al. 1978

Z Physik A

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Lifetimes and intensities of the A-X, B-A, C-A and b a systems in CO have beenmeasured at high spectral resolution using the High Frequency Deflection technique. Of special interest are the pressure effects observed in the A-X and b-a transitions, both as a function of the partial pressure of CO and as a function of added catalyst gas such as argon, helium and CO 2. The nature of these pressure effects are examined with the conclusion that resonance induced collision exchange takes place between the A or b states and other states that strongly perturb them. In particular, the collision exchange cross section estimated for the A state is unusually large, being the order of 10-7 to 10-8 cm3/s, mol. In contrast, the B and C (Rydberg) states, which are not known to be highly perturbed, showed no evidence of collision induced exchange. In addition, calculations on Franck-Condon factors and ~-centroids have been carried out for each of the bands studied. Transition moments and oscillator strengths are also extracted from these calculations and from the new data presented in this paper, and considerable discrepancies to earlier values in the literature are found in some cases.

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“…The elements oftheone-matrixD(I) and the two-matrix D (2) in this basis are expressible in terms of the symmetric function The applications to Be 2 use the further approximation that the geminal operator Gt is a spin singlet operator. We also consider only real orbitals and real geminal coefficients gi' This means that i + m being the conjugate spin orbital to i has opposite spin and the same orbital part.…”

Section: Theorymentioning

confidence: 99%