TY - JOUR
T1 - Twin mass peak ion source for comparative mass spectrometry
T2 - Application to circular dichroism laser MS
AU - Logé, Christoph
AU - Bornschlegl, Alexander
AU - Boesl, Ulrich
N1 - Funding Information:
This work has been supported by the Deutsche Forschungsgemeinschaft DFG.
PY - 2009/4/1
Y1 - 2009/4/1
N2 - A pulsed ion source has been developed supplying two slightly shifted mass spectra for every single ionization pulse, e.g., by laser induced resonance enhanced multiphoton ionization (REMPI). This allows comparison of ion signals with a difference of relative intensity in the percent and sub-percent range. Such small differences may be due to small changes of gas composition or of ionization conditions and usually are hidden by pulse to pulse fluctuations of laser pulse energy, gas density, electric fields, ion detection, etc. With the presented twin-peak ion source, both ion signals are subject to the same fluctuations which will influence the ratio of the ion signals only marginally. This method has been applied to circular dichroism laser mass spectrometry, where relative ion signal ratios 2(Ir - Il)/(Ir + Il) due to ionization with right and left circularly polarized light have to be recorded in the 10-3 range and below.
AB - A pulsed ion source has been developed supplying two slightly shifted mass spectra for every single ionization pulse, e.g., by laser induced resonance enhanced multiphoton ionization (REMPI). This allows comparison of ion signals with a difference of relative intensity in the percent and sub-percent range. Such small differences may be due to small changes of gas composition or of ionization conditions and usually are hidden by pulse to pulse fluctuations of laser pulse energy, gas density, electric fields, ion detection, etc. With the presented twin-peak ion source, both ion signals are subject to the same fluctuations which will influence the ratio of the ion signals only marginally. This method has been applied to circular dichroism laser mass spectrometry, where relative ion signal ratios 2(Ir - Il)/(Ir + Il) due to ionization with right and left circularly polarized light have to be recorded in the 10-3 range and below.
KW - Circular dichroism
KW - Dynamic chemical trace analysis
KW - Pulsed ion source
KW - Resonant laser ionization
KW - Time-of-flight mass spectrometry
UR - http://www.scopus.com/inward/record.url?scp=61449261025&partnerID=8YFLogxK
U2 - 10.1016/j.ijms.2009.01.008
DO - 10.1016/j.ijms.2009.01.008
M3 - Article
AN - SCOPUS:61449261025
SN - 1387-3806
VL - 281
SP - 134
EP - 139
JO - International Journal of Mass Spectrometry
JF - International Journal of Mass Spectrometry
IS - 3
ER -