Dunham coefficients for seven isotopic species of CO

Guelachvili, G.; Villeneuve, David; Farrenq, R.; Urban, W.; Vergès, J.

doi:10.1016/0022-2852(83)90203-5

Cited by 195 publications

(71 citation statements)

References 19 publications

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“…These excited state rotational constants are obtained by using the well-known rotational constants ͑B 0 Љ , D 0 Љ , and H 0 Љ͒ of the CO (X 1 ⌺ ϩ ) ground state. 28 Because of the high rotational excitation observed in the present study, addition of the third-order rotational constant H 0 Ј provides a significant improvement of the rotational fit. The results of this rotational fit are shown in Fig.…”

Section: Resultsmentioning

confidence: 74%

Rotationally resolved photoionization dynamics of hot CO fragmented from OCS

Rijs

Backus

Lange

et al. 2002

The Journal of Chemical Physics

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The photoionization dynamics of rotationally hot CO, photodissociated from OCS, have been studied using laser photoelectron spectroscopy via the intermediate B 1 ⌺ ϩ Rydberg state leading to the X 2 ⌺ ϩ of the ion. The photodissociation of OCS near 230 nm produces rotationally hot, but vibrationally cold CO (X 1 ⌺ ϩ ,NЉ,vЉϭ0,1) fragments along with S ( 1 D) atoms. These high rotational levels show photoelectron spectra with a very strong ⌬Nϭ0 transition and weaker ⌬N ϭϮ1, Ϯ2, and Ϯ3 transitions. Agreement between measured and calculated spectra is good and suggests that there is significant angular momentum coupling in the photoelectron orbital. In the ionization step not only ⌬vϭ0, but also off-diagonal, non-Franck-Condon (⌬v 0) transitions are observed. The intensities of these transitions vary strongly within the region studied and can be explained by the excitation of superexcited Rydberg states with an A 2 ⌸ core.

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Section: Resultsmentioning

confidence: 74%

Rotationally resolved photoionization dynamics of hot CO fragmented from OCS

Rijs

Backus

Lange

et al. 2002

The Journal of Chemical Physics

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“…The data obtained in one-and two-photon spectra for a certain state and isotope were combined in a single leastsquares minimization routine. The energies of the X 1 ⌺ ϩ ground state levels were calculated from the constants of Guelachvili et al 28 The outcome of these fitting procedures is presented in Tables I-IV for the four different isotopomers observed. The lines that were found to be affected by local perturbations, resulting in line shifts, were omitted from the fits.…”

Section: Spectroscopic Resultsmentioning

confidence: 99%

Accidental predissociation phenomena in theE 1Π,v=0 andv=1 states of 12C16O and 13C16O

Cacciani

Hogervorst

Ubachs

1995

The Journal of Chemical Physics

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We have studied vϭ0 and vϭ1 levels of the E 1 ⌸ state of CO in excitation from the ground state by one-and two-photon transitions, thus probing e and f ⌳-doublet components. New accidental predissociations were found in the E 1 ⌸, vϭ0 state for high J values ͑J e ϭ41, 44 for 12 C 16 O and J e ϭ41, 50 for 13 C 16 O͒. The predissociation phenomenon in the E 1 ⌸, vϭ1 state at Jϭ7 was reinvestigated and for both e and f components also Jϭ9, 10, and 12 were found to be perturbed. Perturbations by all three spin components of a k 3 ⌸, vϭ5 state were deduced. Furthermore the accidental predissociation in E 1 ⌸, vϭ0 J e ϭ31 was reinvestigated. Measurements of spectral line shifts were modeled assuming a spin-orbit coupling between E 1 ⌸ and the 3 ⌸ 1 component of the k 3 ⌸ state. Relative predissociation lifetimes of k 3 ⌸, vϭ3 and 5 with respect to E 1 ⌸, vϭ0 and vϭ1 are deduced from an analysis of observed intensity effects. For the E 1 ⌸, vϭ1 state rotational state dependent lifetimes were determined at low-J values. Line positions of CO lines were calibrated on an absolute frequency scale within 0.05 cm Ϫ1 against the tellurium and iodine standard in the visible. Accurate molecular constants for the E 1 ⌸, vϭ0 and vϭ1 states are determined for both 12 C 16 O and 13 C 16 O. The E 1 ⌸, vϭ1 state of 12 C 17 O is observed for the first time.

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“…Chackerian & Tipping (1983) used the Dunham coefficients derived by Dale et al (1979), and the EDMF, used by them, was obtained by using the data from various accurate observations. Hure & Roueff (1993) used the energies which were in agreement often better than 0.01 cm −1 with the laboratory data of Farrenq et al (1991), Le Floch (1991a, b), Guelachvili et al (1983), and the EDMF was that calculated by Cooper & Kirby (1987). Goorvich & Chackerian (1994a, b) used the Dunham coefficients of Farrenq et al (1991) and the EDMF experimentally derived by Chackerian et al (1984).…”

Section: Introductionmentioning

confidence: 92%

Einstein A-coefficients for vib-rotational transitions in CO

Chandra

Maheshwari

Sharma

1996

Astron. Astrophys. Suppl. Ser.

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Abstract. -Einstein A-coefficients for vib-rotational transitions in CO isotopomers, for vibrational quantum number v up to 20, rotational quantum number J up to 140, and ∆v up to 4, are calculated. The change in J is governed by the selection rules ∆J = ±1. These coefficients play an important role in astronomy, as CO is the most abundant molecule after H2, and has been observed in almost all the astronomical objects.

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Dunham coefficients for seven isotopic species of CO

Cited by 195 publications

References 19 publications

Rotationally resolved photoionization dynamics of hot CO fragmented from OCS

Rotationally resolved photoionization dynamics of hot CO fragmented from OCS

Accidental predissociation phenomena in theE 1Π,v=0 andv=1 states of 12C16O and 13C16O

Einstein A-coefficients for vib-rotational transitions in CO

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