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Title: Laser-induced-fluorescence studies of fragment ions: CH/sup +/ and CD/sup +/

Abstract

The dynamics of ion-molecule interactions within a mass selective rf quadrupole ion trap are studied for several ion-molecule systems. Laser induced fluorescence is used as a probe of the internal energy distributions of molecular ions under collision free conditions and under controlled collision conditions. The effects of collisions at near thermal energies (0.3 to 0.5 eV) are easily understood in terms of processes such as charge transfer and other energy transfer mechanisms. The A/sup 1/PI - X/sup 1/..sigma../sup +/ system of CH/sup +/ and CD/sup +/ has been examined under collision free conditions. The ions were produced from methane through electron impact ionization/dissociation. The observed energy distributions reflect the dynamical partitioning of dissociation exothermicity, excepting short lived electronic states. Many new transitions belonging to this electronic system have been observed and a reliable vibrational frequency for the X/sup 1/..sigma../sup +/ state has been obtained. The radiative lifetimes of CH/sup +/ and CD/sup +/ A/sup 1/PI(v = 0) states have been measured and a revised oscillator strength for the A-X transition has been derived from this data.

Authors:
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
OSTI Identifier:
6249587
Report Number(s):
LBL-13258
ON: DE82001010; TRN: 81-017557
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: Thesis
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; CARBON COMPOUNDS; ION-MOLECULE COLLISIONS; DEUTERIDES; HYDRIDES; MOLECULAR IONS; FLUORESCENCE; DISSOCIATION; EXPERIMENTAL DATA; IONIZATION; LASER RADIATION; CHARGED PARTICLES; COLLISIONS; DATA; DEUTERIUM COMPOUNDS; ELECTROMAGNETIC RADIATION; HYDROGEN COMPOUNDS; INFORMATION; ION COLLISIONS; IONS; LUMINESCENCE; MOLECULE COLLISIONS; NUMERICAL DATA; RADIATIONS; 640304* - Atomic, Molecular & Chemical Physics- Collision Phenomena

Citation Formats

O'Keefe, A. Laser-induced-fluorescence studies of fragment ions: CH/sup +/ and CD/sup +/. United States: N. p., 1981. Web. doi:10.2172/6249587.
O'Keefe, A. Laser-induced-fluorescence studies of fragment ions: CH/sup +/ and CD/sup +/. United States. https://doi.org/10.2172/6249587
O'Keefe, A. 1981. "Laser-induced-fluorescence studies of fragment ions: CH/sup +/ and CD/sup +/". United States. https://doi.org/10.2172/6249587. https://www.osti.gov/servlets/purl/6249587.
@article{osti_6249587,
title = {Laser-induced-fluorescence studies of fragment ions: CH/sup +/ and CD/sup +/},
author = {O'Keefe, A},
abstractNote = {The dynamics of ion-molecule interactions within a mass selective rf quadrupole ion trap are studied for several ion-molecule systems. Laser induced fluorescence is used as a probe of the internal energy distributions of molecular ions under collision free conditions and under controlled collision conditions. The effects of collisions at near thermal energies (0.3 to 0.5 eV) are easily understood in terms of processes such as charge transfer and other energy transfer mechanisms. The A/sup 1/PI - X/sup 1/..sigma../sup +/ system of CH/sup +/ and CD/sup +/ has been examined under collision free conditions. The ions were produced from methane through electron impact ionization/dissociation. The observed energy distributions reflect the dynamical partitioning of dissociation exothermicity, excepting short lived electronic states. Many new transitions belonging to this electronic system have been observed and a reliable vibrational frequency for the X/sup 1/..sigma../sup +/ state has been obtained. The radiative lifetimes of CH/sup +/ and CD/sup +/ A/sup 1/PI(v = 0) states have been measured and a revised oscillator strength for the A-X transition has been derived from this data.},
doi = {10.2172/6249587},
url = {https://www.osti.gov/biblio/6249587}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Aug 01 00:00:00 EDT 1981},
month = {Sat Aug 01 00:00:00 EDT 1981}
}