Showing papers in "Journal of Photochemistry in 1974"

TL;DR: In this article, the photolysis at 330 − 380 nm of mixtures containing parts per million concentrations of gaseous nitrous acid in pure nitrogen and oxygen has been studied in a flow system.

TL;DR: In this paper, the effect of CO and of SO 2 on the rate of photolysis of part per million concentrations of gaseous nitrous acid in N 2 -O 2 mixtures has been studied.

TL;DR: In this paper, the authors used a modulation technique to estimate the absolute and relative rate constants at 300K for the following reactions, assuming rapid equilibration between the three closely spaced vibrationally excited levels of O3, and that only the lowest level of these, the ν2 bending mode, is active in reaction.

TL;DR: In this article, the rate constants for the reaction of hydroxyl with isobutane with other aliphatic hydrocarbons and with other radical rates have been obtained.

TL;DR: In this paper, the absorption, emission and photochemistry of xanthione (XS), an aromatic thioketone with a C 2ν molecular geometry, have been investigated in solution at room temperature and 77 K.

TL;DR: In this article, the reaction kinetics in the excited state were determined by investigating the absorption and emission spectra and the time-dependence of the fluorescence intensity of 7-hydroxycoumarin and 4-methyl-7-hydroxymethyl-7hydroxycaroline in different solvents using a model of the reaction which took into account the dependence of diffusion-controlled rate parameters on the dielectric constant of the solution.

TL;DR: In this paper, the violet and red emission spectra of (3P0,2) atoms formed in the dissociative excitation collision between metastable argon atoms and HCN, CH3CN, (CN)2, ClCN and BrCN were observed in a flowing afterglow apparatus.

TL;DR: In this article, a highly sensitive experimental method was described for the kinetic study of lead atoms in the lowest spin orbit component of the ground state configuration, which is generated by the pulsed irradiation of lead tetraethyl and monitored photoelectrically in absorption by time-resolved attenuation of atomic resonance radiation at 283.3 nm.

TL;DR: In this article, the rate data for the collisional removal of C(2 1 S 0 ) by He, H 2, N 2, CO, CH 4 and C 3 O 2 are compared and compared with existing data in the literature.

TL;DR: In this paper, a commercial polybutadiene system has been investigated and it is concluded that quenching of the excited states of the α,β-unsaturated carbonyl compounds, formed in the auto-oxidative chain reaction, that must be achieved if stabilization by a mechanism of this sort is to be effective.

TL;DR: In this paper, the photolysis of C3D8 has been investigated with 8.4, 10.0, and 11.8 eV photons, using HI to scavenge the radicals through the reaction: RD + HI → RDH + I (where RD is a fully deuterated alkyl or alkenyl radical).

TL;DR: In this paper, the vibrational populations and effective rotational temperatures of the CN violet (B 2 Σ−X 2 ) bands with medium resolution were estimated by a band-envelope analysis.

TL;DR: In this article, the photolysis of SO 2 in H 2 has been studied at 147 nm (xenon line) and at 116.5 - 123.6 nm (krypton lines).

TL;DR: In this paper, a method was described for the kinetic study of electronically excited arsenic atoms, As(42D j ), generated by pulsed irradiation and monitored photoelectrically in absorption by attenuation of atomic resonance radiation.

TL;DR: In this article, the electron transfer to N 2 O from a photoexcited species in competition with its spontaneous deactivation was investigated and it was shown that the quantum yield of this species is significantly less than unity.

TL;DR: In this article, the phase angle of 2288 nm fluorescence relative to a fixed reference signal has been measured as a function of the partial pressure of quenching gas in a microwave discharge lamp modulated at 30 kHz.

TL;DR: In this paper, the authors studied the kinetics of the photochemical gas phase fluorination of CF2O in cells of quartz and of aluminium and obtained the following activation energies: E2 = 6.2 kcal, E5 − E4 = 5 kcal and E8 = 11 ± 3 kcal.

TL;DR: In this paper, the authors investigated the photoenolization of 2,4,5-trimethylbenzaldehyde, 2, 4, and 2, 5-dimethyl benzaldehydes in a durene single crystal as a function of light intensity and temperature.

TL;DR: In this paper, the triplet lifetime of 2-pentanone has been measured in the gas phase and in n-hexane solution at very low conversion, and it was concluded that all the hot photodecomposition arises from the singlet state.

TL;DR: In this paper, the photolysis of H 2 O 2 at 2537 A and 298 K has been studied in the presence of CO, where the photodecomposition of H O 2 leads to a chain reaction initiated by the reaction: propagation proceeding by: and terminated by: The chain reaction can be inhibited by addition of oxygen, which scavenges the H atoms.

TL;DR: In this article, it has been shown that in some aromatics, the radiationless transition from the excited singlet state to the second triplet state (S 1 → T 2 ) is possible, leading to high intrinsic quenching rate constants by large Franck Condon factors.