Single-Photon Ionization of the Primary Photofragments of Chlorine Monoxide

Abstract

The single-photon ionization mass spectrometry of primary photofragments of chlorine monoxide (ClO) is reported. The use of laser-produced plasma (LPP) radiation in pump–probe experiments allows us to ionize the laser-generated atomic photoproducts with tunable radiation in the vacuum ultraviolet regime (E = 10–18 eV). Autoionization resonances of the atomic photoproducts are used to establish the quantum states of the photoproducts and to enhance the detection sensitivity. Predissociation and direct dissociation of A (2Π)-excited ClO yields Cl (2 P )+ O (3 P ) as well as Cl (2 P )+ O (1 D ), respectively. The quantum yield of O (1 D ) formation is reported in the threshold regime near the ClO [ A (2Π)] dissociation limit.

Photoionization of the3s23p43Pand the3s2Barthel1, Flesch2, Rühl3 et al. 2015Phys. Rev. A201200View full textAdd to dashboardCite

“…Plasma radiation is dispersed by a gold coated spherical reflection grating (1200 lines/mm). The absolute number of VUV photons is estimated to be of the order of 10 8 photons per pulse, corresponding to 10 9 photons per second at 10 Hz operation of the lasers, which is similar to previous work [24,25,[42][43][44]. The typical bandwidth of the dispersed VUV photons is set to ∆λ ≈ 2.4 -5.9Å, depending on the spectral features to be resolved in the respective energy regime.…”

Photoionization of the $3s^23p^4~ ^3P$ and the $3s^23p^4~^1D,~^1S$ states of sulfur: experiment and theory

“…The absolute number of VUV photons is estimated to be of the order of 10 8 photons per pulse, corresponding to 10 9 photons per second at 10 Hz operation of the lasers, which is similar to previous work [24,25,[42][43][44]. The typical bandwidth of the dispersed VUV photons is set to ∆λ ≈ 2.4 -5.9 Å, depending on the spectral features to be resolved in the respective energy regime.…”

Ultraviolet Photolysis of the ClO Dimer

“…Photolysis experiments of the ClO dimer are carried out at 250 and 308 nm. Figure shows a series of photolysis mass spectra: Figure a shows the photolysis of ClO ( T = 298 K) at 250 nm, yielding Cl( 2 P 3/2 ) + O( 1 D). , Intense positive mass signals are due to photoionization of these atomic photolysis products. The VUV photon energy is set to 13.45 eV because O( 1 D) is probed selectively at this photon energy by autoionization .…”