Matrix-assisted laser desorption/ionization by using femtosecond laser pulses in the near-infrared wavelength regime.
We observe a substantial matrix-assisted laser desorption/ionization (MALDI) signal when irradiating femtosecond laser pulses in the near-infrared spectral range centered around 800 nm and using standard MALDI matrices with absorption bands in the ultraviolet (UV) regime. The laser pulse energy dependence of this novel phenomenon is investigated in comparison with MALDI with near-UV laser pulses. Our observations show that multiphoton absorption/ionization could be a major issue among the MALDI processes when the sample is irradiated with ultra-short laser pulses.
Wichmann
J M
JM
Freie Universität Berlin, Institut für Experimentalphysik, Arnimallee 14, 14195 Berlin, Germany. wichmann@physik.fu-berlin.de
Lupulescu
C
C
Wöste
L
L
Lindinger
A
A