Electronic spectroscopy and energy transfer pathways of matrix isolated iodine

Abstract

Articles you may be interested inA simple but accurate potential for the naphthalene-argon complex: Applications to collisional energy transfer and matrix isolated IR spectroscopy Visible laser excitation (460-725 nm) of dilute rare gas/12 (2000: 1) matrices resulted in emission from the lzA 3TI ( 1 u ) state. Reanalysis of the A.-X spectra provided revised molecular constants for matrix isolated 1 2 , A state lifetimes of 70 ± 20, 80 ± 20, and 110 ± 30 f.Ls were observed in Ar, Kr, and Xe hosts, respectively. Excitation spectra for the A state closely followed the 12 continuum absorption spectrum, indicating that transfer from the B 3TI(Ou+) and ITI(1u) states was effective in populating Iz(A). At dilution ratios of 600: 1 or lower the I 2 P 1/2 _2 P 3/2 transition was observed in conjunction with the A-X bands. Excitation studies showed that isolated I atoms, trapped during the deposition process, were excited by energy transfer from nearby If molecules. A vibronic progression, similar to the A-X bands, but shifted to longer wavelengths, was noted in concentrated Rg/lz (300: 1) matrices. This system, which was emitted with a lifetime of about 10 ms, most probably originated from perturbed 12 A' 3TI(2 u )' Intermolecular energy transfer was observed in matrices that contained 12 codeposited with 02' Electronic excitation of I z resulted in a long-lived emission from O 2 a I Ll g • Matrices containing high concentrations of iodine also exhibited 02(a) .-1(2p II 2 ) transfer. . R FI G. 1. Approximate potential energy curves for selected low-energy electronic states of 1 2 , 674

Spectroscopic Signatures of Halogens in Clathrate Hydrate Cages. 2. Iodine

“…Roughly, the dispersion forces for water molecules will be similar to those of argon, and thus, the clathrate cage environment might be similar to that of an argon matrix (or other rare gas matrices), for which iodine spectra have been extensively analyzed. [27][28][29] However, in rare gas matrices, the shift of the iodine absorption band does not exceed 200 cm -1 . Thus, as simple dispersion interactions alone are unlikely to account for the observed clathrate spectra, stronger perturbations are needed.…”

I2 Dissociation Mechanisms In the Chemical Oxygen-Iodine Laser Revisited Using Three- And One- Dimensional Computational Fluid Dynamics Modeling

“…As observed in Ref. 16, transport of I 2 diluted by N 2 in a copper tubing results in production of I atoms due to surface catalyzed I 2 predissociation. The I 2 dissociation fraction observed in Ref.…”

“…The I 2 dissociation fraction observed in Ref. 16 is estimated to be ~ 0.1%. 31 We checked if the small number of I atoms produced by the predissociation in the copper pipes used to transport the I 2 /N 2 flow to the injection location may result in the acceleration of the I 2 dissociation in the COIL so that g at the optical axis could reach the experimental values.…”

“…(16) once the process of the stimulated emission is incorporated in the calculation of [I*] and [I], Ĩ the intracavity circulating intensity propagating in one direction and hν is the energy of an I * I → photon. The term stim R is included in the kinetic equations for the species I* and I solved in the optical resonator.…”

Probing intermolecular communication via lattice phonons with time-resolved coherent anti-Stokes Raman scattering†

“…X( 1 P þ g ) emission frequency (local difference potential value) is determined. The chosen parameters are those that match the experimental emission peak [35]. Implicit in this determination is the assumption that the I-Ar interactions are identical for I 2 in its A( 3 Å 1u ) and B( 3 Å þ 0u ) electronic states.…”