ISSN:
0030-493X
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Ion-to-neutral conversion at surfaces is found to be complementary to that with gas-phase targets for neutralization-reionization mass spectrometry and to yield high-energy neutral species. With an Ag surface deposited on an in-line Si substrate, neutralization-reionization efficiencies of 0.01% are achieved using 9.8 keV CH4+·, with the neutral CH4 receiving a median internal energy of 14 eV; with a conventional target of K vapor, the efficiency is 0.4% with a neutral energy of 8.2 eV expected from their ionization energy difference. The energy deposition can be increased by increasing the potential that deflects ions into the surface; in this way ∼15% of CH4 neutral species can be given 〉20 eV of internal energy. Product abundances from CH4 dissociation provide a useful estimate of the distribution of energy values deposited in neutralization.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/oms.1210281008
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