Photodissociation Dynamics of Hydride Molecules: H Atom Photofragment Translational Spectroscopy

Ashfold, Michael N. R.; Mordaunt, David H.; Wilson, Steven H. S.

doi:10.1002/9780470133521.ch3

Cited by 38 publications

(10 citation statements)

References 390 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Wen et al 15 detected H and D atoms from the photodissociation of three isotopic variants of methanol using the high-n Rydberg atom time-of-flight (HRTOF) technique. 16 Their results were in reasonable agreement with the previous result by Satyapal et al (ref. 14) Photodissociation of methanol at 157 nm via the S 2 state is much more complicated.…”

Section: Introductionsupporting

confidence: 92%

Product pair correlation in CH₃OH photodissociation at 157 nm: the OH + CH₃channel

Chen

Eppink

Jiang

et al. 2011

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

The OH + CH 3 product channel for the photodissociation of CH 3 OH at 157 nm was investigated using the velocity map imaging technique with the detection of CH 3 radical products via (2+1) resonance-enhanced multiphoton ionization (REMPI). Images were measured for the CH 3 formed in the ground and excited states (v 2 = 0, 1, 2, and 3) of the umbrella vibrational mode and correlated OH vibrational state distributions were also determined. We find that the vibrational distribution of the OH fragment in the OH + CH 3 channel is clearly inverted. Anisotropic distributions for the CH 3 (v 2 = 0, 1, 2, and 3) products were also determined, which is indicative of a fast dissociation process for the C-O bond cleavage. A slower CH 3 product channel was also observed, that is assigned to a two-step photodissociation process, in which the first step is the production of a CH 3 O(X 2 E) radical via the cleavage of the O-H bond in CH 3 OH, followed by probe laser photodissociation of the nascent CH 3 O radicals yielding CH 3 (X 2 A 1 , v = 0) products.

show abstract

Section: Introductionsupporting

confidence: 92%

Product pair correlation in CH₃OH photodissociation at 157 nm: the OH + CH₃channel

Chen

Eppink

Jiang

et al. 2011

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…Recent laboratory experiments investigated the photochemistry of silane and the subsequent reactions of the photodissociation products. These data suggested that more complex, hydrogenated silicon clusters of the generic formula Si 2 H x (x = 1-6) are formed in these processes (Cook et al 2001;Zavelovich & Lyman 1989;Hu et al 2003;Glenewinkel-Meyer et al 1993;Tonokura et al 1992;Perkins et al 1979;Borsella et al 1988;Ashfold et al 1996;Aka & Boch 2002;Wang & Huang 1998;Oikawa et al 1994). Their experiments suggest that a rich silane chemistry is expected in the circumstellar envelope of IRC+10216: photochemistry of silane molecules close to the photosphere could contribute to the formation of small hydrogenated silicon clusters of the generic formula Si 2 H x .…”

Section: Introductionmentioning

confidence: 95%

Infrared spectroscopic studies of hydrogenated silicon clusters

Kaiser

Osamura

2005

A&A

View full text Add to dashboard Cite

Abstract. Silicon-bearing species Si 2 H x (x = 1-6) are probable candidates in the circumstellar envelope of IRC+10216. We have observed several fundamentals of new silicon-containing radicals Si 2 H 3 and Si 2 H 5 in addition to the well-known Si 2 H 4 and Si 2 H 6 species from infrared spectroscopy in low temperature silane matrices at 10 K. Several infrared bands identify the Si 2 H x species and can be used to search for these molecules in the circumstellar envelope of IRC+10216. These infrared bands are confirmed by ab initio quantum chemical calculation as well as via corresponding infrared spectra detected for the deuterated species Si 2 D x .

show abstract

“…Furthermore, the finite length of the electron impact ionizer used gives rise to an uncertainty of the TOF path length, often setting a limit for the achievable translation energy resolution in TOF measurements. 6 These shortcomings of electron impact ionization can be overcome by the application of the resonance-enhanced multiphoton ionization ͑REMPI͒ technique 7 or the high-n Rydberg tagging 3,8,9 method. Since both of these techniques are based on laser excitation, a small laser spot size at the photodissociation/photoionization ͑PD/PI͒ region can be achieved by focusing and thus minimizing the uncertainty due to the TOF path length.…”

Section: Introductionmentioning

confidence: 99%

“…However, the laser focusing required for REMPI can cause space charge broadening in TOF ion imaging measurements. The high-n Rydberg tagging TOF method, 8,9 which involves TOF measurements of neutral species in excited high-n Rydberg states, is not subject to the space charge effect, making it an ideal method for TOF measurements of product fragments formed in photodissociation and bimolecular reactions.…”

Section: Introductionmentioning

confidence: 99%

“…3,9,10 The application of the high-n Rydberg tagging TOF method to heavier multielectron atoms is more challenging because the lifetimes of Rydberg states of multielectron atoms are generally shorter than those of H atom. Nevertheless, known experimental techniques can be employed to lengthen the lifetimes of atomic and molecular Rydberg states [11][12][13] and thus to enhance the performance of high-n Rydberg tagging TOF measurements of multielectron atoms.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High-resolution Rydberg tagging time-of-flight measurements of atomic photofragments by single-photon vacuum ultraviolet laser excitation

Jones

Zhou

Yang

et al. 2008

Review of Scientific Instruments

View full text Add to dashboard Cite

By coupling a comprehensive tunable vacuum ultraviolet (VUV) laser system to a velocity-mapped ion imaging apparatus, we show that high-resolution high-n Rydberg tagging time-of-flight (TOF) measurements of nascent atomic photofragments formed by laser photodissociation can be made using single-photon VUV laser photoexcitation. To illustrate this single-photon Rydberg tagging TOF method, we present here the results of the VUV laser high-n Rydberg tagging TOF measurements of O((3)P(2)) and S((3)P(2)) formed in the photodissociation of SO(2) and CS(2) at 193.3 and 202.3 nm, respectively. These results are compared to those obtained by employing the VUV laser photoionization time-sliced velocity-mapped ion imaging technique. The fact that the kinetic energy resolutions achieved in the VUV laser high-n Rydberg tagging TOF measurements of O and S atoms are found to be higher than those observed in the VUV laser photoionization, time-sliced velocity-mapped ion imaging studies show that the single-photon VUV laser high-n Rydberg tagging TOF method is useful and complementary to state-of-the-art time-sliced velocity-mapped ion imaging measurements of heavier atomic photofragments, such as O and S atoms. Furthermore, the general agreement observed between the VUV laser high-n Rydberg tagging TOF and velocity-mapped ion imaging experiments supports the conclusion that the lifetimes of the tagged Rydberg states of O and S atoms are sufficiently long to allow the reliable determination of state-resolved UV photodissociation cross sections of SO(2) and CS(2) by using the VUV laser high-n Rydberg tagging TOF method.

show abstract

Photodissociation Dynamics of Hydride Molecules: H Atom Photofragment Translational Spectroscopy

Cited by 38 publications

References 390 publications

Product pair correlation in CH₃OH photodissociation at 157 nm: the OH + CH₃channel

Product pair correlation in CH₃OH photodissociation at 157 nm: the OH + CH₃channel

Infrared spectroscopic studies of hydrogenated silicon clusters

High-resolution Rydberg tagging time-of-flight measurements of atomic photofragments by single-photon vacuum ultraviolet laser excitation

Contact Info

Product

Resources

About

Photodissociation Dynamics of Hydride Molecules: H Atom Photofragment Translational Spectroscopy

Cited by 38 publications

References 390 publications

Product pair correlation in CH3OH photodissociation at 157 nm: the OH + CH3channel

Product pair correlation in CH3OH photodissociation at 157 nm: the OH + CH3channel

Infrared spectroscopic studies of hydrogenated silicon clusters

High-resolution Rydberg tagging time-of-flight measurements of atomic photofragments by single-photon vacuum ultraviolet laser excitation

Contact Info

Product

Resources

About

Product pair correlation in CH₃OH photodissociation at 157 nm: the OH + CH₃channel

Product pair correlation in CH₃OH photodissociation at 157 nm: the OH + CH₃channel