H-atom photofragments from H2O2 dissociated at 193 nm

Quantum yield for hydrogen atom formation from H2O2 photolysis in the range 193–240 nm

“…As listed in Table I, our H (193) value is in good agreement with those presented by the two former studies [5,7]. It should be noted that the σ H 2 O 2 (193) used by Gerlach-Meyer et al [5] was somewhat larger than that recommended by NASA/JPL [3], as commented by Vaghjiani et al [7].…”

“…It should be noted that the σ H 2 O 2 (193) used by Gerlach-Meyer et al [5] was somewhat larger than that recommended by NASA/JPL [3], as commented by Vaghjiani et al [7]. Therefore, the H (193) value presented by Gerlach-Meyer et al [5] in Table I is modified using the recently recommended cross-section value [3,17]. This study provides the first determination of H (λ) at 207, 210, 220, 230 nm.…”

“…In the experiments, the photolysis wavelength was changed alternatively between the reference (210 nm) and target wavelength. The values of H (λ) at four target wavelengths were obtained using the c The value of 0.12 ± 0.01 which was originally reported by Gerlach-Meyer et al [5] has been modified using the new crosssection value recommended by NASA [3] and by Nicovich and Wine [17] (see text).…”

“…As reviewed by the IUPAC Subcommittee on Gas Kinetics Data Evaluation [4], there are several experimental studies on the measurements of the quantum yields of the primary photoproducts from H 2 O 2 photolysis in the UV region. Gerlach-Meyer et al [5] determined the H atom quantum yield at 193 nm to be 0.12 ± 0.01, using pulsed laser photolysis of H 2 O 2 with H-atom detection by laser-induced fluorescence (LIF).…”

Photostability of Isolated and Paired Nucleobases: NH Dissociation of Adenine and Hydrogen Transfer in its Base Pairs Examined by Laser Spectroscopy

“…The excitation of the Lyman-a band of atomic hydrogen at 121.6 nm (2 243.1 nm) is a very sensitive method for the detection of H photodissociation products [13] and was used recently to investigate the UV photodissociation of pyrrole via photofragment velocity map imaging. [14] Figure 2 shows the H-atom Doppler profile for the photodissociation of adenine at 243.1 nm.…”