High resolution double-resonance spectroscopy on Rydberg states of CO

Drabbels, Marcel; Heinze, Johannes; Meulen, J. J. ter; Meerts, W. Leo

doi:10.1063/1.465919

Cited by 47 publications

(49 citation statements)

References 32 publications

(2 reference statements)

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“…This observation was not made by the previous experiments that focused on measuring the rotational line widths. 8,24 A local perturbation may exist at the upper J′ = 6 level that causes the branching ratio to be a little F. J(4sσ) 1 Σ + (v′ = 1). The J(4sσ) 1 Σ + (v′ = 1) state has been observed to be strongly dissociative with a lifetime in the order of picoseconds, 22,32 and thus, it has not been observed in any of the photoionization spectra.…”

Section: Resultsmentioning

confidence: 99%

Branching Ratio Measurements for Vacuum Ultraviolet Photodissociation of ¹²C¹⁶O

et al. 2013

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ABSTRACT:The branching ratios for the spin-forbidden photodissociation channels of 12 C 16 O in the vacuum ultraviolet (VUV) photon energy region from 102 500 (12.709 eV) to 106 300 cm −1 (13.180 eV) have been investigated using the VUV laser time-slice velocity-map imaging photoion technique. The excitations to three 1 Σ + and six 1 Π Rydberg-type states, including the progression of W(3sσ) 1 Π(v′ = 0, 1, and 2) vibrational levels of CO, have been identified and investigated. The branching ratios for the product channels C( 3 P) + O( 3 P), C( 1 D) + O( 3 P), and C( 3 P) + O( 1 D) of these predissociative states are found to depend on the electronic, vibrational, and rotational states of CO being excited. Rotation and e/f-symmetry dependences of the branching ratios into the spin-forbidden channels have been confirmed for several of the 1 Π states, which can be explained using the heterogeneous interaction with the repulsive D′ 1 Σ + state. The percentage of the photodissociation into the spin-forbidden channels is found to increase with increasing the rotational quantum number for the K(4pσ) 1 Σ + (v′ = 0) state. This has been rationalized using a 1 Σ + to 1 Π to 3 Π coupling scheme, where the final 3 Π state is a repulsive valence state correlating to the spin-forbidden channel.

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Section: Resultsmentioning

confidence: 99%

Branching Ratio Measurements for Vacuum Ultraviolet Photodissociation of ¹²C¹⁶O

et al. 2013

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“…36 For the B 1 ⌺ ϩ , vϭ2 state a detailed model involving the coupling with DЈ 1 ⌺ ϩ was worked out, 37 while the J-and paritydependent predissociation of W 1 ⌸, vϭ0 and L 1 ⌸, vϭ0 states was also attributed to a heterogeneous coupling with the DЈ 1 ⌺ ϩ state. 10,38 If the overall predissociation of the E 1 ⌸, vϭ0 and vϭ1 states would be due to such an interaction with this DЈ 1 ⌺ ϩ state, then a J-dependent interaction is expected with a predissociation rate…”

Section: Discussionmentioning

confidence: 99%

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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“…After comparison with the measured spectrum, a small discrepancy between the R-and P-branch intensities was Notes. Comparison with previous predissociation rate results: E91 (Eidelsberg et al 1991), L92b (Levelt et al 1992b), D93 (Drabbels et al 1993), E94 ), E06 (Eidelsberg et al 2006), L92a (Levelt et al 1992), K95 (Komatsu et al 1995). (a) Predissociation rates in units of (10 11 s −1 ); (b) x = J(J+1); (c) held fixed; (d) perturbation results in anomalous line broadening pattern; rate is ∼6 for J < 6, 1.8(6) for J = 6, and 3.3 + 0.017 x for J > 6 (see text).…”

Section: P(2) Complexmentioning

confidence: 99%

High-resolution study of oscillator strengths and predissociation rates for¹²C¹⁶O

Eidelsberg

Lemaire

Federman

et al. 2012

A&A

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Models of astronomical environments containing CO require accurate molecular data to reproduce and interpret observations. We are conducting experiments at the SOLEIL synchrotron facility to acquire data for modeling CO photochemistry in the vacuum ultraviolet. The improvement in UV spectroscopic instrumentation, both in sensitivity and resolution, provides more accurate laboratory spectroscopic determinations. We report new measurements yielding photoabsorption oscillator strengths and predissociation rates, for 12 C 16 O at 295 K and 77 K, of four bands from X 1 Σ + (v = 0) to the v = 0-3 vibrational levels of the core-excited W 1 Π Rydberg state and for six overlapping bands between 92.97 and 93.35 nm. Absorption spectra were recorded using the vacuum ultraviolet Fourier transform spectrometer installed on the DESIRS beamline at SOLEIL, providing a resolving power R = 350 000. This resolution allows the analysis of individual line strengths and widths in the electronic transitions and the identification of a previously unobserved perturbation in the W(1) level. Gas column densities in the differentially-pumped system were calibrated using the B 1 Σ + -X 1 Σ + (0, 0) band. Absorption bands are analyzed by synthesizing line and band profiles with independently developed codes. These considerably improved results are compared with earlier determinations.

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High resolution double-resonance spectroscopy on Rydberg states of CO

Cited by 47 publications

References 32 publications

Branching Ratio Measurements for Vacuum Ultraviolet Photodissociation of ¹²C¹⁶O

Branching Ratio Measurements for Vacuum Ultraviolet Photodissociation of ¹²C¹⁶O

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

High-resolution study of oscillator strengths and predissociation rates for¹²C¹⁶O

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High resolution double-resonance spectroscopy on Rydberg states of CO

Cited by 47 publications

References 32 publications

Branching Ratio Measurements for Vacuum Ultraviolet Photodissociation of 12C16O

Branching Ratio Measurements for Vacuum Ultraviolet Photodissociation of 12C16O

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

High-resolution study of oscillator strengths and predissociation rates for12C16O

Contact Info

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Resources

About

Branching Ratio Measurements for Vacuum Ultraviolet Photodissociation of ¹²C¹⁶O

Branching Ratio Measurements for Vacuum Ultraviolet Photodissociation of ¹²C¹⁶O

High-resolution study of oscillator strengths and predissociation rates for¹²C¹⁶O