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Laser Desorption/Vacuum Ultraviolet Photoionization of Alkanethiolate Self‐assembled Monolayers
Author(s) -
Trevor Jennifer L.,
Hanley Luke,
Lykke Keith R.
Publication year - 1997
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/(sici)1097-0231(199704)11:6<587::aid-rcm877>3.0.co;2-j
Subject(s) - chemistry , photoionization , monolayer , mass spectrometry , desorption , monomer , mass spectrum , analytical chemistry (journal) , ultraviolet , ion , laser , photochemistry , ionization , chromatography , organic chemistry , adsorption , optics , biochemistry , physics , polymer
Self‐assembled monolayers of straight‐chain alkanethiolates (RS) on gold were studied by nitrogen laser desorption followed by vacuum ultraviolet (118 nm) photoionization of secondary neutrals in a time‐of‐flight mass spectrometer. The dominant feature of all photoionization mass spectra were the dimers (RSSR + ) for all thiolates studied. No monomer ions (RS + ) were observed, in contrast with previous results from time‐of‐flight secondary ion and direct laser desorption mass spectrometry. Results are presented from experiments on the tetradecyl (C 14 ) and hexadecyl (C 16 ) mercaptan monolayers. Mixed C 14 /C 16 monolayers generated both pure and mixed dimers, indicating a facile association between different monomer chain lengths. © 1997 John Wiley & Sons, Ltd.