TY - JOUR
T1 - Schottky barrier governed injection of solvated ions through track membrane interfaced vacuum inlets
AU - Gridin, Vladimir V.
AU - Schechter, I.
N1 - Funding Information:
This research was supported by the Israel Science Foundation (founded by the Israel Academy of Sciences & Humanities), by the James–Franck Program for Laser Matter Interaction, and by the fund for promotion of research at the Technion–IIT. We are grateful to A.A. Balakin for assistance in interfacing our TOF-MS with the EMIS facility.
PY - 2000/4/14
Y1 - 2000/4/14
N2 - Poly(ethylene terephthalate) track membranes (TM) were recently suggested for electrostatic injection of charged species into time-of-flight mass spectrometers (TOF-MS). A Schottky-type barrier reduction was investigated using a thermally activated extraction regime. A brief description of the physical processes involved is given. A wide range of the externally applied electrical potential, Φ, was covered. Collector currents were found to exhibit an activation-like behavior, ~exp(-ΔF/k(B)T), whereas the free energy difference, ΔF, across the liquid-to-vacuum boundary is such that ΔF = ΔF0 - ΔFΦ. An externally controlled term, ΔFΦ, was also sensitive to the salt concentration for the KCl/glycerol solutions used. A dramatic decrease of ΔF(ΔΦ → 0) was found for an increasing charge cartier concentration. In accordance with the thermionic emission mechanism of ion extraction, the Schottky effect has manifested itself in ΔFΦ ~ Φ 1(/)2. (C) 2000 Elsevier Science B.V.
AB - Poly(ethylene terephthalate) track membranes (TM) were recently suggested for electrostatic injection of charged species into time-of-flight mass spectrometers (TOF-MS). A Schottky-type barrier reduction was investigated using a thermally activated extraction regime. A brief description of the physical processes involved is given. A wide range of the externally applied electrical potential, Φ, was covered. Collector currents were found to exhibit an activation-like behavior, ~exp(-ΔF/k(B)T), whereas the free energy difference, ΔF, across the liquid-to-vacuum boundary is such that ΔF = ΔF0 - ΔFΦ. An externally controlled term, ΔFΦ, was also sensitive to the salt concentration for the KCl/glycerol solutions used. A dramatic decrease of ΔF(ΔΦ → 0) was found for an increasing charge cartier concentration. In accordance with the thermionic emission mechanism of ion extraction, the Schottky effect has manifested itself in ΔFΦ ~ Φ 1(/)2. (C) 2000 Elsevier Science B.V.
KW - Extraction
KW - Membrane
KW - Multichannel
KW - Time-of-flight
KW - Track-membrane
UR - http://www.scopus.com/inward/record.url?scp=0034646585&partnerID=8YFLogxK
U2 - 10.1016/S1387-3806(00)00154-8
DO - 10.1016/S1387-3806(00)00154-8
M3 - 文章
AN - SCOPUS:0034646585
SN - 1387-3806
VL - 198
SP - 63
EP - 69
JO - International Journal of Mass Spectrometry
JF - International Journal of Mass Spectrometry
IS - 1-2
ER -