UNSPECIFIED. (1994) INITIAL VELOCITIES OF POSITIVE AND NEGATIVE PROTEIN MOLECULE-IONS PRODUCED IN MATRIX-ASSISTED ULTRAVIOLET-LASER DESORPTION USING A LIQUID MATRIX. CHEMICAL PHYSICS LETTERS, 222 (6). pp. 579-585. ISSN 0009-2614

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Abstract

The initial axial velocities for the positive and negative cytochrome c molecule-ions desorbed from a liquid matrix (3-nitrobenzyl alcohol) using a 17 ns ultraviolet laser (266 nm) have been determined. The method employed was based upon measurement of ion flight times through a field-free path co-axial with the ion optical axis. The possible interferences, such as energy deficits, due to the presence of electric fields were avoided by using a grid-electrode placed at a very short distance from the sample stage. The potential of this electrode was maintained at the same potential as the sample stage, thereby creating a narrow field-free region within which ion generation took place. Systematic variations of the potential at a second grid-electrode caused a gradual shift of the ion flight times, which could be related to the initial ion velocities. The ion velocities were obtained by correlating the measured time-shifts with values from theoretical analysis. The positive and negative molecule-ions were found to have axial velocities of 840 +/- 70 and 750 +/- 40 ms-1, respectively.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry Q Science > QC Physics
Journal or Publication Title:	CHEMICAL PHYSICS LETTERS
Publisher:	ELSEVIER SCIENCE BV
ISSN:	0009-2614
Date:	3 June 1994
Volume:	222
Number:	6
Number of Pages:	7
Page Range:	pp. 579-585
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/20631

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