Photofragment imaging: The 266 nm photodissociation of CH3I

Femtosecond Photodissociation Dynamics by Velocity Map Imaging. The Methyl Iodide Case

“…4.4 provide the branching ratio between the I and I * channels (I/I * ) in correlation with vibrationless methyl. An asymptotic value of 0.11 ± 0.02 was obtained, in agreement with previous works [36][37][38].…”

The Reaction Microscope: Imaging and Pulse Shaping Control in Photodynamics

“…As explained in Section 1 multidimensional particle imaging techniques are able to reveal molecular dynamics in unprecedented detail. [9,10,12,13,16,18,[26][27][28][95][96][97] Especially, photoelectron-photoion coincidence imaging in combination with femtosecond timeresolved pump-probe spectroscopy is extremely powerful to provide insightful information on multiphoton multichannel dynamics. [34,39,65,98] In this example we review first experimental results, which were reported recently, [99] combining velocity map (noncoincidence) electron and ion-imaging techniques with ultrafast pulse shaping to study the detailed mechanism of control of molecular ionization and fragmentation processes in polyatomic molecules.…”

“…Because of the extended ionization region of several mm along the direction of the (laser) light propagation, a substantial blurring results that limits the achievable energy resolution (about 10-15 %) in the original ion-imaging design. [9,[16][17][18] The problems of limited resolution due to the extended source region were solved to a large extent by the invention of the velocity map imaging (VMI) technique in 1997 by Eppink and Parker. [19] A three-plate assembly, repeller, extractor and TOF entrance, with two open gridless electrodes (extractor, TOF entrance) was used to image or map the velocity of the particles onto the detector.…”

A velocity-map imaging study of methyl non-resonant multiphoton ionization from the photodissociation of CH 3 I in the A-band

“…photodissociation in the centre of the absorption band has been extensively studied originally by time-of-flight mass spectrometry [20] and imaging techniques [21]. Later on, the study was extended to the red [4,22,23] and blue edges [24] using imaging techniques in conjunction with (2 + 1) REMPI detection of the CH 3 and I( 2 P 3/2 ) and I*( 2 P 1/2 ) photofragments at different excitation wavelengths.…”