Photodissociation of NO2 in the (2)B22 state: A slice imaging study and reinterpretation of previous results

Abstract

The photodissociation dynamics of nitrogen dioxide have been probed above the second dissociation limit at photolysis wavelengths close to 226 nm. The O( 3 P J ) + NO( 2 Π Ω ) product channel has been examined using direct current slice velocity map has been found to favor the production of vibrationally cold, highly rotationally excited NO( 2 Π Ω ) products with all three oxygen spin-orbit components. Other minor dissociation channels which produce O( 3 P J ) atoms have also been identified. We discuss the significance of these dissociation channels and present a reinterpretation of previous studies of NO 2 dissociation on excitation to the (2) 2 B 2 state.

Near ultraviolet photochemistry of 2-bromo- and 2-iodothiophene: Revealing photoinduced ring opening in the gas phase?

“…As with several other reported spectrometer designs, [30][31][32][33][34][35][36] the ion optics assembly described in Ref. 25 provided a convenient starting point.…”

Photodissociation of ClNO in the 2 1A′ State: Computational and Experimental NO Product State Distributions

“…[ 32 , 33 ] Briefly, gaseous ClNO was prepared by mixing samples of Cl 2 and NO in a stainless steel cylinder and backfilling with He carrier gas. Typical samples consisted of about 0.133 bar of Cl 2 and about 0.266 bar of NO in 8.0 bar of He (≈5 %).…”

“…The apparatus used has been described elsewhere. [32,33] The product NO was ionised by (2 + 1) REMPI via the D 2 S + ! X 2 P or C 2 P !…”

“…[34] In our version of the method, the voltages of the VMI lens are adjusted for direct-current slice-imaging, [35] and the microchannel plate detector is gated with a short (< 10 ns) high-voltage pulse to record only a thin slice through the centre of the Newton sphere of stateselected ions, as described in ref. [33].…”

Angular distributions for the inelastic scattering of NO(X2Π) with O2(X3Σg−)

“…Slice imaging, [46][47][48][49][50][51][52][53][54][55] in which one or more time slices through the Newton sphere are extracted as separate ion images, would be an ideal method to extract DCSs for the different oxygen rotational states from the overall ion image. Slice imaging would allow the extraction of the central slice of the Newton sphere, removing out-of-plane scattering contributions from the ion image and thus more directly yielding the velocity distribution of the probed scattered product.…”