Time-resolved spectroscopy of some transient molecules
Date
2006
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Abstract
We have developed a time-resolved gated-integration method where the growth or decay of the concentration of a given transient molecule in a hollow cathode discharge can be monitored. Two identical boxcars integrators provide two gates with predetermined widths, one monitoring end of discharge-off period (where no absorption takes place) and the other measuring at the absorption signal at a given delay time with respect to the discharge stop time. Then, by subtracting/dividing the two signals, the growth or decay of the concentration of the studied molecule is obtained. Decay of the concentration of C3 was found to be relatively long, on the order of millisecond. This decay was studied as a function of helium buffer gas pressure (10, 15 and 20 Torr). A linear dependency of the lifetime vs. buffer gas pressure was observed. Also, lifetimes of 24.5(1.5) ?s and 21 (1) ?s were measured for the two short-lived molecular ions H3 + and HN2 +, respectively.
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Bibliography: p. 82-87
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Citation
Dehghany Mohammad Abady, M. (2006). Time-resolved spectroscopy of some transient molecules (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/225