180
M. Dantus and C.L. Kalcic
Fig. 8.4 [5] Instrumental setup of the amplified laser and 3D ion trap mass spectrometer
Fig. 8.5 [5] Short pulses are critical to fs-LID. Transform limited pulses with a duration of 35 fs
maximize the intensity of the fs-LID product ion signal, while pulses that are stretched to 100 fs in
duration result in a 80 % loss of signal intensity
pass the beam through the ion trap without hitting any of the metal surfaces, and
it also provides a high peak power at the ion packet for ion activation. The unfocused beam (6.8 × 10 9 W/cm 2 ) does not provide a peak power sufficient to initiate
fs-LID; experiments indicate that a peak power on the order of 10 13 W/cm 2 must be
achieved before an fs-LID product ion signal is observed (data not shown).
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