A 2+1 REMPI study of the E-X transition in CO. Indirect predissociations in the E 1Π state

Baker, Jacob; Lemaire, J. L.; Couris, Stelios; Vient, A.; Malmasson, D.; Rostas, F.

doi:10.1016/0301-0104(93)85093-n

Cited by 39 publications

(55 citation statements)

References 24 publications

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“…20 In the present paper we present results of two different laser-based investigations of the E 1 ⌸, vϭ0 and vϭ1 states. First a 2ϩ1 resonantly enhanced multiphoton ionization ͑REMPI͒ technique was applied, similar to previous work by Hines et al 21 and Baker et al 11 Because we observed signals from samples of 12 C 16 O and 13 C 16 O heated to 1000 K new information on high-lying rotational states up to JϷ50 was obtained. For 12 C 16 O new accidental predissociaa͒ tions were observed at J e ϭ41 and 44 and similarly for 13 C 16 O at J e ϭ41 and 50.…”

Section: Introductionmentioning

confidence: 73%

“…The wavelength range for this band is unfortunately located at the high frequency limit of the tellurium absorption atlas, 22 so the O and P branches and only the beginning of the R and S branches could be calibrated using an interpolation proce- (8) is clearly missing, while P(10), P (11), and P(13) have lower intensities than expected. The O(9) line has nearly disappeared, i.e., the intensity at the frequency position of O (9) is fully due to the overlapping R(17) line.…”

Section: A 2؉1 Rempi Measurementsmentioning

confidence: 94%

“…First, two-photon laser excitation revealed the predissociation behavior of both e and f levels for E 1 ⌸, vϭ1 in several isotopes including 12 C 18 O, 13 C 16 O, and 13 C 18 O. 11 Second, in a vuv spectrographical study a vibrational progression k 3 ⌸, vϭ2, 3 and 5 was observed in excitation from the ground state. 17 This allowed reassignment of the vibrational progression observed by Wan and Langhoff 18 in CO excited by electron bombardment.…”

Section: Introductionmentioning

confidence: 99%

“…In view of its astrophysical importance a number of detailed spectroscopic investigations on CO in the vuv range have been performed in recent years, by making use of classical spectrographs, 4,5 synchrotron sources [6][7][8] and laser sources. [9][10][11] The E 1 ⌸ and C 1 ⌺ ϩ states, correlating with 3 p and 3p electronic orbitals have the largest integrated absorption cross sections among the predissociated states and therefore are crucial for the understanding of the photochemistry of CO in the interstellar medium.…”

Section: Introductionmentioning

confidence: 99%

“…In two recent publications by Baker et al 11,17 the issue of the accidental predissociations in the E 1 ⌸ state was addressed. First, two-photon laser excitation revealed the predissociation behavior of both e and f levels for E 1 ⌸, vϭ1 in several isotopes including 12 C 18 O, 13 C 16 O, and 13 C 18 O.…”

Section: Introductionmentioning

confidence: 99%

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Accidental predissociation phenomena in the E 1Π, v=0 and v=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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Section: Introductionmentioning

confidence: 73%

Section: A 2؉1 Rempi Measurementsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Cacciani

Hogervorst

Ubachs

1995

The Journal of Chemical Physics

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Precision Laser Spectroscopy in the Extreme Ultraviolet

Eikema

Ubachs

2011

Handbook of High‐resolution Spectroscopy

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Techniques for the production of short wavelengths in the extreme ultraviolet wavelength range are described, spanning low‐order harmonic generation in the perturbative regime for narrow bandwidth XUV production to the plateau‐regime with the three‐step collisional model for the generation of high harmonics with broadband ultrafast pulses. In addition, the intermediate regime is discussed for pulses of 300 ps duration, as well as the regime of harmonic conversion based on continuous wave lasers aiming at the production of coherent Lyman‐α radiation. Applications of XUV sources in the frequency domain typically rely on the production of XUV‐light from narrowband Fourier‐transform‐limited pulses for recording high‐resolution spectra. Alternatively, harmonically upconverted pulses of ultrashort duration (with inter‐pulse coherence) can be used for spectroscopic studies in the time and frequency domain (such as direct frequency comb spectroscopy techniques). Examples of both approaches for atomic and molecular spectroscopy are discussed at some length. For precision metrology on atomic systems, a focus is put on the Lamb shift determination in the He ground state. In the realm of molecular spectroscopy, predissociation phenomena in the nitrogen molecule are highlighted, with relevance for dissociation processes occurring in the upper layers of the Earth atmosphere. Similar predissociation phenomena in carbon monoxide are also treated in some detail, in this case with relevance for the chemistry in interstellar clouds. Precision XUV spectroscopy of molecular hydrogen is discussed as well, as it relates to the possibility of detecting a variation of the proton–electron mass ratio on a cosmological time scale. In the last section, applications of direct frequency comb spectroscopic techniques at short wavelengths are explained and prospects are given for using these techniques at extreme ultraviolet wavelengths.

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