Abstract
The initial axial velocities for the positive and negative cytochrome c molecule-ions desorbed from a liquid matrix (3-nitro-benzyl 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.
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