Single vibronic level fluorescence spectra from the state of p-difluorobenzene vapor

Coveleskie, R. A.; Parmenter, C. S.

doi:10.1016/0022-2852(81)90108-9

Cited by 61 publications

(38 citation statements)

References 16 publications

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“…Each expected fluorescent transition is detected as a decrease in photoacoustic signal caused by SEP, although some transitions appear only as unresolved shoulders on the rotational envelopes of stronger transitions. The agreement between predicted and observed transition energies for the 3 1 5 1 6 1 and 5 3 levels is within expectations, considering the ± 5 em -I accuracy of the fluorescence data 23 and the difference in excitation bandwidth (28 em -I for fluorescence vs . ;;; 1 em -I for SEP).…”

Section: Stimulated Emission Pumping Inp-difluorobenzenesupporting

confidence: 77%

“…In addition to the strong 0-0 band at 271.44 nm, the p-DFB spectrum consists predominantly of progressions in v 5 and v 3 , plus sequences associated with members of these progressions. 23 The 6~ band is the strongest observed absorption involving quantum changes in modes other than v 5 and v 3 • 23 Single vibronic level fluorescence studies have identified the transition labeled kin Fig. 2 with 5 contributing most of the transition intensity.…”

Section: Stimulated Emission Pumping Inp-difluorobenzenementioning

confidence: 99%

“…5 are easily assigned by considering the p-DFB single vibronic level fluorescence spectra and ground state fundamentals given in Ref. 23. In absorption and emission, the Franck-Condon factors allow large changes in vibrational quantum numbers for only modes v 3 and v 5 • 23 Quantum number changes for v 6 are limited to ± 1.…”

Section: Stimulated Emission Pumping Inp-difluorobenzenementioning

confidence: 99%

“…In absorption and emission, the Franck-Condon factors allow large changes in vibrational quantum numbers for only modes v 3 and v 5 • 23 Quantum number changes for v 6 are limited to ± 1. 23 Changes in quantum numbers in other modes produce transitions which are weaker by an order of magnitude. the PUMP laser.…”

Section: Stimulated Emission Pumping Inp-difluorobenzenementioning

confidence: 99%

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Photoacoustic detection of stimulated emission pumping in p-difluorobenzene

Moll

Parker

Kuppermann

1984

The Journal of Chemical Physics

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Photoacoustic detection has b~en used to monitor a stimulated emission pumping process in p-difluorobenzene. Using the A 1 B 2 u 5 1 state as an intermediate, several vibrational levels of the ground electronic state were populated. The photoacoustic method is an attractive alternative to other detection techniques because of its sensitivity, simplicity, and its ability to differentiate between stimulated emission pumping and excited state absorption. An example of excited state absorption in aniline is given.

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Section: Stimulated Emission Pumping Inp-difluorobenzenesupporting

confidence: 77%

Section: Stimulated Emission Pumping Inp-difluorobenzenementioning

confidence: 99%

Section: Stimulated Emission Pumping Inp-difluorobenzenementioning

confidence: 99%

Section: Stimulated Emission Pumping Inp-difluorobenzenementioning

confidence: 99%

See 2 more Smart Citations

Photoacoustic detection of stimulated emission pumping in p-difluorobenzene

Moll

Parker

Kuppermann

1984

The Journal of Chemical Physics

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“…The S 1 ← S 0 spectroscopy of the pDFB chromophore is well known. 30,31 Dispersed fluorescence and mass analyzed threshold ionisation ͑MATI͒ experiments have established the vibrational distributions within the pDFB product following dissociation from the lower lying vibrations ͑Ͻ1000 cm −1 ͒. 11,[20][21][22][23] VMI has been used to determine the binding energy in the S 0 and S 1 states of the neutral and D 0 state of the cation.…”

Section: Introductionmentioning

confidence: 99%

Recoil energy distributions for dissociation of the van der Waals molecule p-difluorobenzene–Ar with 450–3000cm−1 excess energy

Bellm

Lawrance

2005

The Journal of Chemical Physics

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Velocity map imaging has been used to measure the distributions of translational energy released in the dissociation of p-difluorobenzene-Ar van der Waals complexes from the 5 1 , 3 1 , 5 2 , 3 1 5 1 , 5 3 , 3 2 , and 3 2 5 1 states. These states span 818-3317 cm −1 of vibrational energy and correspond to a range of energies above dissociation of 451-2950 cm −1 . The translational energy release ͑recoil energy͒ distributions are remarkably similar, peaking at very low energy ͑10-20 cm −1 ͒ and decaying in an exponential fashion to approach zero near 300 cm −1 . The average translational energy released is small, shows no dependence on the initial vibrational energy, and spans the range 58-72 cm −1 for the vibrational levels probed. The average value for the seven levels studied is 63 cm −1 . The low fraction of transfer to translation is qualitatively in accord with Ewing's momentum gap model ͓G. E. Ewing, Faraday Discuss. 73, 325 ͑1982͔͒. No evidence is found in the distributions for a high energy tail, although it is likely that the experiment is not sufficiently sensitive to detect a low fraction of transfer at high translational energies. The average translational energy released is lower than has been seen in comparable systems dissociating from triplet and cation states.

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A Tour of Vibrational Predissociation from Seven Levels in the S₁ p‐Difluorobenzene‐Ar van der Waals Complex

Hye-Keun

Parmenter

1988

Ber Bunsenges Phys Chem

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The absorption and fluorescence characteristics of p‐difluorobenzene‐Ar van der Waals complexes prove ideally suited for experimental study of vibrational predissociation (VP). The process has been observed from seven S1 complex levels that contain a total of six different ring modes. The levels have vibrational energies ranging between 240 and 900 cm−1. VP lifetimes are in the range of 2 – 12 ns for six of the levels. The other has a 200 ns lifetime, possibly because of relatively poor coupling of its hydrogenic bending motion with the dissociation coordinate. VP almost always occurs with only one or two major channels. The only exception is a level using three important channels. Remarkably, the final states of the VP are always the same, either 00 or 61 of the monomer. A strong Δv = 1 or 2 propensity rule for ring mode changes governs these VPs. The VP channels cannot be modelled well with the full collision state‐to‐state propensity rules known for Ar collisions. Difficulties are also encountered in modelling with a Golden Rule momentum gap formulation that has been successful in other systems.

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Single vibronic level fluorescence spectra from the state of p-difluorobenzene vapor

Cited by 61 publications

References 16 publications

Photoacoustic detection of stimulated emission pumping in p-difluorobenzene

Photoacoustic detection of stimulated emission pumping in p-difluorobenzene

Recoil energy distributions for dissociation of the van der Waals molecule p-difluorobenzene–Ar with 450–3000cm−1 excess energy

A Tour of Vibrational Predissociation from Seven Levels in the S₁ p‐Difluorobenzene‐Ar van der Waals Complex

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Single vibronic level fluorescence spectra from the state of p-difluorobenzene vapor

Cited by 61 publications

References 16 publications

Photoacoustic detection of stimulated emission pumping in p-difluorobenzene

Photoacoustic detection of stimulated emission pumping in p-difluorobenzene

Recoil energy distributions for dissociation of the van der Waals molecule p-difluorobenzene–Ar with 450–3000cm−1 excess energy

A Tour of Vibrational Predissociation from Seven Levels in the S1 p‐Difluorobenzene‐Ar van der Waals Complex

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A Tour of Vibrational Predissociation from Seven Levels in the S₁ p‐Difluorobenzene‐Ar van der Waals Complex