TY - JOUR
T1 - Mechanism of cationization of sucrose by sodium in laser desorption
T2 - A study by fourier transform mass spectrometry
AU - Chiarelli, M. Paul
AU - Gross, Michael L.
PY - 1987/9/24
Y1 - 1987/9/24
N2 - A double-substrate, split probe was used in conjunction with Fourier transform mass spectrometry (FTMS) to study the mechanism of cationization of sucrose during laser desorption (LD). The split probe serves to separate spatially the NaCl and sucrose while maintaining coincidence with the laser beam. Gas-phase cationization is found to occur at laser powers of 106 W cm-2, whereas little evidence for this mechanism is found at higher laser powers of 1010 W cm-2. Lower power LD is apparently sufficiently long-lived and the selvedge regions sufficiently overlapped that gas-phase cationization can occur. Under high power LD conditions, cationized molecules emerge directly from the surface or possibly from clusters desorbed from the surface. The selvedge region associated with the organic surface is short-lived and of insufficient dimension that cationization does not occur or the plasma generated is too hot to provide sufficient stabilizing collisions for the ion/molecule reaction products.
AB - A double-substrate, split probe was used in conjunction with Fourier transform mass spectrometry (FTMS) to study the mechanism of cationization of sucrose during laser desorption (LD). The split probe serves to separate spatially the NaCl and sucrose while maintaining coincidence with the laser beam. Gas-phase cationization is found to occur at laser powers of 106 W cm-2, whereas little evidence for this mechanism is found at higher laser powers of 1010 W cm-2. Lower power LD is apparently sufficiently long-lived and the selvedge regions sufficiently overlapped that gas-phase cationization can occur. Under high power LD conditions, cationized molecules emerge directly from the surface or possibly from clusters desorbed from the surface. The selvedge region associated with the organic surface is short-lived and of insufficient dimension that cationization does not occur or the plasma generated is too hot to provide sufficient stabilizing collisions for the ion/molecule reaction products.
UR - http://www.scopus.com/inward/record.url?scp=18844365546&partnerID=8YFLogxK
U2 - 10.1016/0168-1176(87)87040-4
DO - 10.1016/0168-1176(87)87040-4
M3 - Article
AN - SCOPUS:18844365546
SN - 0168-1176
VL - 78
SP - 37
EP - 52
JO - International Journal of Mass Spectrometry and Ion Processes
JF - International Journal of Mass Spectrometry and Ion Processes
IS - C
ER -