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Investigation of the effects of cooling after laser desorption before post‐ionization
Author(s) -
Steenvoorden R. J. J. M.,
Van Der Hage E. R. E.,
Boon J. J.,
Kistemaker P. G.,
Weeding T. L.
Publication year - 1994
Publication title -
organic mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0030-493X
DOI - 10.1002/oms.1210290203
Subject(s) - ionization , laser , atmospheric pressure laser ionization , soft laser desorption , atomic physics , ion , desorption , photoionization , mass spectrometry , ion source , matrix assisted laser desorption electrospray ionization , ultraviolet , fragmentation (computing) , supersonic speed , mass spectrum , polyatomic ion , radiation , chemistry , materials science , electron ionization , optics , physics , matrix assisted laser desorption/ionization , optoelectronics , adsorption , thermodynamics , operating system , organic chemistry , chromatography , computer science
To evaluate the necessity for cooling laser‐desorbed molecules to obtain molecular ions and minimal fragmentation, mass spectra of a series of methoxybenzenes were measured in two different experimental configurations. In one geometry, laser‐desorbed molecules were entrained in a pulsed supersonic jet before ionization. In the other, the molecules were ionized directly after laser desorption. The samples were ionized with laser‐generated vacuum ultraviolet radiation in a single‐photon process or ultraviolet radiation in a multi‐photon process.
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