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The reactivity and spectroscopy of small ions

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The reactivity and spectroscopy of small ions
作者:	Flad, Jonathan Edward.
面頁冊數:	71 p.
附註:	Adviser: Richard N. Zare.
附註:	Source: Dissertation Abstracts International, Volume: 65-04, Section: B, page: 1882.
Contained By:	Dissertation Abstracts International65-04B.
標題:	Chemistry, Physical.
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3128388
ISBN:	0496756508

The reactivity and spectroscopy of small ions
Flad, Jonathan Edward.

The reactivity and spectroscopy of small ions [electronic resource] - 71 p.

Adviser: Richard N. Zare.

Thesis (Ph.D.)--Stanford University, 2004.

The second section describes experiments using cavity ring-down spectroscopy to measure the number densities of the molecular nitrogen cation in a pulsed nozzle discharge. The purpose of the experiments is to characterize, using an ultra sensitive absorption technique, an inexpensive pulse discharge nozzle built in the laboratory with spare parts. The number densities are calculated by measuring several rotational lines within the N2+ B 2Sigmau+ - X 2Sigma g+ (0-0) transition around 391 nm. The radial dependence of the number density is calculated using the inverse Abel transform. The number density is found to be &sim;2 x 1010 cm -3 near the center of the discharge and decreases gradually to the discharge's edge. The temporal profile of the discharge is determined by adjusting the time delay between the nozzle opening and the laser firing. The number density of N2+ was found not to change dramatically over the entire range of time delay measured.

ISBN: 0496756508Subjects--Topical Terms:

226924
Chemistry, Physical.

The reactivity and spectroscopy of small ions
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245 1 4 $a The reactivity and spectroscopy of small ions $h [electronic resource]
300 $a 71 p.
500 $a Adviser: Richard N. Zare.
500 $a Source: Dissertation Abstracts International, Volume: 65-04, Section: B, page: 1882.
502 $a Thesis (Ph.D.)--Stanford University, 2004.
520 # $a The second section describes experiments using cavity ring-down spectroscopy to measure the number densities of the molecular nitrogen cation in a pulsed nozzle discharge. The purpose of the experiments is to characterize, using an ultra sensitive absorption technique, an inexpensive pulse discharge nozzle built in the laboratory with spare parts. The number densities are calculated by measuring several rotational lines within the N2+ B 2Sigmau+ - X 2Sigma g+ (0-0) transition around 391 nm. The radial dependence of the number density is calculated using the inverse Abel transform. The number density is found to be &sim;2 x 1010 cm -3 near the center of the discharge and decreases gradually to the discharge's edge. The temporal profile of the discharge is determined by adjusting the time delay between the nozzle opening and the laser firing. The number density of N2+ was found not to change dramatically over the entire range of time delay measured.
520 # $a This dissertation is divided into two sections, each of which describes experiments on small gas-phase cations. The first section presents experiments involving hyperthermal ion-molecule reactions of vibrational state-selected ammonia ions with CD4 and CD3NH2. The purpose of the experiments is to increase our understanding of how the partitioning of energy between internal vibrational modes of the ionic reagent and energy of the ion-molecule collision influence the reaction outcome. A tandem quadrupole-octopole-quadrupole instrument is used to measure the branching ratios and reaction cross sections of the product ions as a function of collision energy and quantum number in the nu2 symmetric bending mode of the ammonia cation. Velocity profiles of the product ions are recorded, providing information about the amount of forward or backward scattering. The degree of vibrational mode selectivity in these reactions is determined by comparing the branching ratios of ammonia ions prepared in two nearly isoenergetic states. Reactions of the ammonia cation with CD4 are shown not to be state-selective. In contrast, reactions with CD3NH2 are found to be mode-selective. It appears that the only state-selective reactions involving ammonia cations are ones in which there is an energetically open charge transfer channel competing with other product channels.
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