INITIAL VELOCITIES OF POSITIVE AND NEGATIVE PROTEIN MOLECULE-IONS PRODUCED IN MATRIX-ASSISTED ULTRAVIOLET-LASER DESORPTION USING A LIQUID MATRIX
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 0009-2614Full text not available from this repository.
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|
|Date:||3 June 1994|
|Number of Pages:||7|
|Page Range:||pp. 579-585|
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