Spectroscopic observation of vibrational Feshbach resonances in near-threshold photoexcitation of X-·CH3NO2 (X- = I- and Br-)

Caroline E.H. Dessent; Jun Kim; Mark A. Johnson

doi:10.1039/a909550k

Spectroscopic observation of vibrational Feshbach resonances in near-threshold photoexcitation of X^-·CH₃NO₂ (X^- = I^- and Br^-)

Caroline E.H. Dessent, Jun Kim, Mark A. Johnson^*

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

Abstract

We report the observation of resonance structure in the absorption and X^-/NO₂^- photofragment action spectra of the X^- ·CH₃NO₂ (X^- = I^- and Br^-) complexes in the region above the electron detachment threshold. The resonance structure corresponds to peaks which appear at the onsets for vibrational excitation of the -NO₂ wag, scissors, and stretch modes of neutral CH₃NO₂, the modes which most strongly distort upon electron capture into its π* lowest unoccupied molecular orbital. We attribute the peaks to excitation of vibrational Feshbach resonances of the CH₃NO₂^- transient negative ion, where near-threshold excitation of X^- ·CH₃NO₂ spectroscopically accesses states of the free electron-CH₃NO₂ system.

Original language	English
Pages (from-to)	395-406
Number of pages	12
Journal	FARADAY DISCUSSIONS
Volume	115
DOIs	https://doi.org/10.1039/a909550k
Publication status	Published - 1 Jan 2000

Access to Document

10.1039/a909550k

Cite this

@article{100be650e49d41e49d45541778e87588,

title = "Spectroscopic observation of vibrational Feshbach resonances in near-threshold photoexcitation of X-·CH3NO2 (X- = I- and Br-)",

abstract = "We report the observation of resonance structure in the absorption and X-/NO2- photofragment action spectra of the X- ·CH3NO2 (X- = I- and Br-) complexes in the region above the electron detachment threshold. The resonance structure corresponds to peaks which appear at the onsets for vibrational excitation of the -NO2 wag, scissors, and stretch modes of neutral CH3NO2, the modes which most strongly distort upon electron capture into its π* lowest unoccupied molecular orbital. We attribute the peaks to excitation of vibrational Feshbach resonances of the CH3NO2- transient negative ion, where near-threshold excitation of X- ·CH3NO2 spectroscopically accesses states of the free electron-CH3NO2 system.",

author = "Dessent, {Caroline E.H.} and Jun Kim and Johnson, {Mark A.}",

year = "2000",

month = jan,

day = "1",

doi = "10.1039/a909550k",

language = "English",

volume = "115",

pages = "395--406",

journal = "FARADAY DISCUSSIONS",

issn = "1359-6640",

publisher = "The Royal Society of Chemistry",

}

TY - JOUR

T1 - Spectroscopic observation of vibrational Feshbach resonances in near-threshold photoexcitation of X-·CH3NO2 (X- = I- and Br-)

AU - Dessent, Caroline E.H.

AU - Kim, Jun

AU - Johnson, Mark A.

PY - 2000/1/1

Y1 - 2000/1/1

N2 - We report the observation of resonance structure in the absorption and X-/NO2- photofragment action spectra of the X- ·CH3NO2 (X- = I- and Br-) complexes in the region above the electron detachment threshold. The resonance structure corresponds to peaks which appear at the onsets for vibrational excitation of the -NO2 wag, scissors, and stretch modes of neutral CH3NO2, the modes which most strongly distort upon electron capture into its π* lowest unoccupied molecular orbital. We attribute the peaks to excitation of vibrational Feshbach resonances of the CH3NO2- transient negative ion, where near-threshold excitation of X- ·CH3NO2 spectroscopically accesses states of the free electron-CH3NO2 system.

AB - We report the observation of resonance structure in the absorption and X-/NO2- photofragment action spectra of the X- ·CH3NO2 (X- = I- and Br-) complexes in the region above the electron detachment threshold. The resonance structure corresponds to peaks which appear at the onsets for vibrational excitation of the -NO2 wag, scissors, and stretch modes of neutral CH3NO2, the modes which most strongly distort upon electron capture into its π* lowest unoccupied molecular orbital. We attribute the peaks to excitation of vibrational Feshbach resonances of the CH3NO2- transient negative ion, where near-threshold excitation of X- ·CH3NO2 spectroscopically accesses states of the free electron-CH3NO2 system.

UR - http://www.scopus.com/inward/record.url?scp=0000041643&partnerID=8YFLogxK

U2 - 10.1039/a909550k

DO - 10.1039/a909550k

M3 - Article

AN - SCOPUS:0000041643

SN - 1359-6640

VL - 115

SP - 395

EP - 406

JO - FARADAY DISCUSSIONS

JF - FARADAY DISCUSSIONS

ER -

Spectroscopic observation of vibrational Feshbach resonances in near-threshold photoexcitation of X-·CH3NO2 (X- = I- and Br-)

Abstract

Access to Document

Other files and links

Cite this

Spectroscopic observation of vibrational Feshbach resonances in near-threshold photoexcitation of X^-·CH₃NO₂ (X^- = I^- and Br^-)