Variation with Temperature of the Continuous Absorption Spectrum of Diatomic Molecules: Part I. Experimental, The Absorption Spectrum of Chlorine

Reactivity of SiCl and SiF groups in SiO2 glass with mobile interstitial O2 and H2O molecules

“…In contrast, the O 2 loading did not induce any obvious absorption bands in the F-doped sample between 2 and 6 eV. The evaluated concentration of interstitial Cl 2 was $2 · 10 18 cm À3 ($5% of total Cl atoms) and the detection limit of interstitial F 2 was $5 · 10 17 cm À3 (<0.1% of total F atoms), assuming that the absorption cross sections are identical to those of gaseous Cl 2 [15] and F 2 [16], respectively. Fig.…”

“…Absorption cross section spectra of gaseous Cl 2 and F 2 molecules are taken from Refs. [15,16]. evaluated assuming that interstitial HCl and HCl dissolved in rare-gas matrices [20,21] have the same absorption intensity.…”

Photochlorination in a tubular reactor

“…However, for low concentrations of chlorine (the maximum value employed experimentally was 0.85 mole % ), p may be assumed zero without affecting significantly the radial distribution of radiation energy. Thus Equations (2) and (5) can be integrated, by assuming an average value of over the pertinent wavelength range, to give (12) Equation (12) was then used to evaluate IA,+/I~,A as a function of r for two cases: (1) p~ = 0 and (2) p~ evaluated from Equation (9) by taking the maximum value of a in the wavelength range and by using an average value of Cclz. The two relationships differed by less than 0.3%.…”

“…If it is assumed that the spectra1 distribution of the Iight at the inside of the reactor wall is the same as that leaving the lamp, lw,A is related to the known total intensity by the ratio FA Ftot 1w,A = Iw,tot -The rate of the actinometer reaction [rate of production of (COOH),] is proportional to I,A, which can be obtained from Equation (12). Then the rate is averaged across the radius of the reactor, lw,A is replaced by Equation (22), and the result is summed over the pertinent wavelength range.…”

Observations of Anomalous Transparency in Bound-Free Transitions ofCl2

“…In systematic studies with decreased relative power densities (from 1 to temperature near 3300 A in the region of the doubled ruby frequency, has been studied extensively. 8 Analysis of the experimental conditions has shown that the following phenomena were of negligible importance on the time scale of the experiments and for the laser powers used in producing observed results: thermal changes in the gas along the laser beam, radial diffusion of atomic fragments, three-body collisions and atomic recombinations, laser-saturated absorption or "bleaching waves," self-focusing (which requires much higher powers than were used). Thus, the observed data must be explained in terms of bound-free absorption and dissociation, anomalous transparency involving nonlinear interactions of the bound-free absorbing system with the incident coherent radiation field, and two-body dephasing collisions.…”