4 Femtosecond Photodissociation Dynamics by Velocity Map Imaging
77
Fig. 4.6 Abel-inverted CH
+
3 images obtained upon excitation of CH 3 I at 267 nm for a pump-probe
delay time of 1 ps. (a) CH 3 detection by nonresonant multiphoton ionization at 802 nm (at least
seven photons are needed). The contrast of this image has been increased by a factor of 4. (b) CH 3
detection by (2 + 1) REMPI at 333.5 nm (Q branch of the 3p z ( 2 A
2 ← 2 A
2 )0 0
0 transition).
(c) Asymptotic center-of-mass CH 3 kinetic energy distributions obtained at 802 nm (red) and
333.5 nm (blue) probe wavelengths together with the assignments made for the different product
channels. The curves have been normalized to clarify the comparison
In early Femtochemistry papers [2], moderately off-resonant laser probes were
identified as the key to explore the presence of transient species between reactants
77
Fig. 4.6 Abel-inverted CH
+
3 images obtained upon excitation of CH 3 I at 267 nm for a pump-probe
delay time of 1 ps. (a) CH 3 detection by nonresonant multiphoton ionization at 802 nm (at least
seven photons are needed). The contrast of this image has been increased by a factor of 4. (b) CH 3
detection by (2 + 1) REMPI at 333.5 nm (Q branch of the 3p z ( 2 A
2 ← 2 A
2 )0 0
0 transition).
(c) Asymptotic center-of-mass CH 3 kinetic energy distributions obtained at 802 nm (red) and
333.5 nm (blue) probe wavelengths together with the assignments made for the different product
channels. The curves have been normalized to clarify the comparison
In early Femtochemistry papers [2], moderately off-resonant laser probes were
identified as the key to explore the presence of transient species between reactants