期刊
REVIEW OF SCIENTIFIC INSTRUMENTS
卷 81, 期 6, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3373977
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资金
- University of Manchester Nuclear Decommissioning Authority Dalton Cumbria
A novel laser desorption system, with improved signal stability and extraordinary long lifetime, is presented for the study of jet-cooled biomolecules in the gas phase using vibrationally resolved photoionization spectroscopy. As a test substance tryptophane is used to characterize this desorption source. A usable lifetime of above 1 month (for a laser desorption repetition rate of 20 Hz) has been observed by optimizing the pellets (graphite/tryptophane, 3 mm diameter and 6 mm length) from which the substance is laser-desorbed. Additionally, the stability and signal-to-noise ratio has been improved by averaging the signal over the entire sample pellet by synchronizing the data acquisition with the rotation of the sample rod. The results demonstrate how a combination of the above helps to produce stable and conclusive spectra of tryptophane using one-color and two-color resonant two-photon ionization studies. (C) 2010 American Institute of Physics. [doi:10.1063/1.3373977]
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