Excited states in bromine photoexcitation and recombination

MacDonald, Lawrence H.; Strong, Robert L.

doi:10.1021/j100171a039

Cited by 5 publications

(2 citation statements)

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“…The first is a gas-phase caging effect analogous to that in fluid solution and operative for high-pressure gases. The second is the formation of gas-phase “cluster complexes” envisioned to be adducts between bromine and the gaseous molecules held together by weak noncovalent van der Waals interactions. − …”

Section: Unimolecular Bond Photodissociationmentioning

confidence: 99%

Factors that Impact Photochemical Cage Escape Yields

Goodwin,

Dickenson,

Ripak

et al. 2024

Chem. Rev.

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The utilization of visible light to mediate chemical reactions in fluid solutions has applications that range from solar fuel production to medicine and organic synthesis. These reactions are typically initiated by electron transfer between a photoexcited dye molecule (a photosensitizer) and a redox-active quencher to yield radical pairs that are intimately associated within a solvent cage. Many of these radicals undergo rapid thermodynamically favored “geminate” recombination and do not diffuse out of the solvent cage that surrounds them. Those that do escape the cage are useful reagents that may undergo subsequent reactions important to the above-mentioned applications. The cage escape process and the factors that determine the yields remain poorly understood despite decades of research motivated by their practical and fundamental importance. Herein, state-of-the-art research on light-induced electron transfer and cage escape that has appeared since the seminal 1972 review by J. P. Lorand entitled “The Cage Effect” is reviewed. This review also provides some background for those new to the field and discusses the cage escape process of both homolytic bond photodissociation and bimolecular light induced electron transfer reactions. The review concludes with some key goals and directions for future research that promise to elevate this very vibrant field to even greater heights.

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Section: Unimolecular Bond Photodissociationmentioning

confidence: 99%

Factors that Impact Photochemical Cage Escape Yields

Goodwin,

Dickenson,

Ripak

et al. 2024

Chem. Rev.

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“…State b is repulsive and dissociates spontaneously into two I atoms (state d) very rapidly, on the order of 100 femtoseconds. 18,19 State c is not repulsive and can only predissociate, but the predissociation rate is too slow to be considered here. 20 Meanwhile, both State b and State c will be deactivated to State a by stimulated emission.…”

Section: Assessment Of Complete Photodissociationmentioning

confidence: 99%

Assessment of a Novel Flow Visualization Technique Using Photodissociation Spectroscopy

Zhao

Tong

2009

Appl Spectrosc

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The study of complicated flows continuously calls for new nonintrusive flow diagnostics. A novel flow visualization technique based on photodissociation spectroscopy (PDS) is described, demonstrated, and assessed in this paper. This technique is centered around the creative use of photodissociation (PD). A PD precursor is seeded in the flow of interest, either passive or reactive. A laser pulse is then generated to completely and rapidly photodissociate both the precursor and the products formed from the precursor (if it reacts) into photofragments. A target photofragment is then imaged to obtain multidimensional information about the flow. An analytical methodology was developed to assess the feasibility of the PDS-based technique. This analytical method was applied to the case where molecular iodine was used as an example PD precursor, and the results were validated by experimental data. Both the analytical and experimental findings provided a promising outlook for this new technique as a practical flow visualization technique. With a properly chosen PD precursor, the PDS-based technique provides an attractive alternative for imaging several critical flow properties, including the mixture fraction and temperature field. This technique shares some key advantages with established techniques, e.g., a high spatial and temporal resolution comparable to the planar laser-induced fluorescence (PLIF) technique. Meanwhile, this technique offers several unique advantages to overcome the limitations of existing techniques, including enhancing the signal level and simplifying the interpretation of the signal.

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Absorption spectra of Cl2, Br2 and BrCl between 190 and 600 nm

Hubinger

Nee

1995

Journal of Photochemistry and Photobiology A: Chemistry

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Excited states in bromine photoexcitation and recombination

Cited by 5 publications

References 0 publications

Factors that Impact Photochemical Cage Escape Yields

Factors that Impact Photochemical Cage Escape Yields

Assessment of a Novel Flow Visualization Technique Using Photodissociation Spectroscopy

Absorption spectra of Cl2, Br2 and BrCl between 190 and 600 nm

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