Photodissociation as Studied by Photolysis Mapping

Solomon, J.

doi:10.1063/1.1712053

Cited by 55 publications

(13 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…3 The use of mirror removal as a radical detection technique dates back to Paneth l5 in the 1930's. It was a powerful method but is subject to considerable difficulties.…”

Section: Methodsmentioning

confidence: 99%

Photolysis Mapping Studies of Aliphatic Carbonyl Compounds

Solomon

Jonah

Chandra

et al. 1971

The Journal of Chemical Physics

View full text Add to dashboard Cite

The photolysis mapping technique is a marriage of an old radical detecting system with the following principle: If polarized light is used for photodissociation, the fiux of fragments will be anisotropic because the molecular absorption is anisotropic in the molecular axis system. The simplest aliphatic carbonyl compounds (formaldehyde, acetaldehyde, propionaldehyde, and acetone) were photodissociated using polarized ultraviolet light. The gases were held at such a low pressure that the fragments travel to the walls without collision in the gas phase. On the walls the radicals were detected by the old mirror removal technique. There is a substantial anisotropy of removal. The sense of the anistropy is different for the different molecules, being perpendicular for formaldehyde and acetone, and parallel for acetaldehyde and propionaldehyde. These results are interpreted by assuming that the carbonyl compounds all become nonplanar in the excited state and the ultimate direction of the fragments can be inferred from the initial motion. In formaldehyde the departing hydrogen atom leaves in a direction perpendicular to the plane as does the methyl in acetone. On the other hand, in acetaldehyde and propionaldehyde the hydrogen atom leaves the molecular plane but remains attached to the central carbon atom while the departing alkyl radicals leave in the molecular plane, parallel to the transition dipole moment.

show abstract

“…3 The use of mirror removal as a radical detection technique dates back to Paneth l5 in the 1930's. It was a powerful method but is subject to considerable difficulties.…”

Section: Methodsmentioning

confidence: 99%

Photolysis Mapping Studies of Aliphatic Carbonyl Compounds

Solomon

Jonah

Chandra

et al. 1971

The Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

“…On the other hand, if we irradiate with light coming from only one direction, or better yet, with linearly polarized light, the molecules that absorb the light will be aligned relative to their transition dipole vectors JliC where i and f are labels for the initial and final states involved in the light absorption. The angular distribution of the excited molecules will now be (5) where () is the angle between the transition dipole JliC (fixed in the molecule) and e the electric vector of the light wave. If we fix another angle Xas the angle between the dissociation momentum P and the transition dipole moment then we have the scheme shown in Fig.…”

Section: Alignment Of Dissociating Moleculesmentioning

confidence: 99%

Photodissociation with Polarized Light

Bersohn

1973

Israel Journal of Chemistry

View full text Add to dashboard Cite

This is a review of a small part of the work on photodissociation with polarized light performed by Kent Wilson and his students [1–4] at the University of California at San Diego and the author and his students [5–7] at Columbia. The physics of the experiment has been presented in a recent review by R.N. Zare [8] who was the first to suggest the utility of such work. We comment on the photodissociation of three molecules — I2,Cd(CH3), and α‐iodonaphthalene.

show abstract

“…[7][8][9] Doppler profiling techniques have been utilized to study the correlation between the fragments' velocities and internal energies. [1][2][3][4][5][6][7][8][9][10][11][12] Multiphoton ionization (MPI) time-of-flight (TOF) tech-niqus have been demonstrated that give the equivalent information obtained by the Doppler techniques without the use of sub-Dopplerlinewidth lasers. 13 These techniques involve the one-dimensional projection of the three-dimensional distribution of particles.…”

Section: Introductionmentioning

confidence: 99%

Two‐dimensional Imaging ofPhotofragments

et al. 1988

View full text Add to dashboard Cite

The technique of photofragment imaging is described, and several examples of the power of the technique are presented. Two-dimensional images of state-selected photofragments from the photodissociations of CD3I and H2S illustrate how photofragment imaging reveals fl parameters, brancing ratios, Doppler profiles and vector correlations. Comparisons are made with Doppler profiling and one-dimensional time-of-flight techniques.

show abstract

Photodissociation as Studied by Photolysis Mapping

Cited by 55 publications

References 6 publications

Photolysis Mapping Studies of Aliphatic Carbonyl Compounds

Photolysis Mapping Studies of Aliphatic Carbonyl Compounds

Photodissociation with Polarized Light

Two‐dimensional Imaging ofPhotofragments

Contact Info

Product

Resources

About