Oxygen atom density and thermal energy control in an electric-oxygen iodine laser

Abstract

Experiments [1] with Electric Oxygen-Iodine Laser (ElectricOIL) heat exchanger technology have demonstrated improved control of oxygen atom density and thermal energy, with minimal quenching of O 2 (a 1 ), and increasing small signal gain from 0.26% cm -1 to 0.30% cm -1 . Heat exchanger technological improvements were achieved through both experimental and modeling studies, including estimation of O 2 (a 1 ) surface quenching coefficients for select ElectricOIL materials downstream of a radio-frequency discharge-driven singlet oxygen generator. Estimation of O 2 (a 1 ) quenching coefficients is differentiated from previous studies by inclusion of oxygen atoms, historically scrubbed using HgO [2][3][4] or AgO [5] . High-fidelity, time-dependent and steady-state simulations are presented using the new BLAZE-VI multi-physics simulation suite [6] and compared to data.

Kinetics of oxygen species in an electrically driven singlet oxygen generator

“…The optimized value γ ∆ = 0.0004 is close to the probability reported in Ref. [36]. The value γ O = 0.007 is in good agreement with the theory developed for high number densities of oxygen atoms [37].…”

“…[33]. It was noted [36,37] that for DOIL systems the values of heterogeneous probabilities γ ∆ and γ O are somewhat higher than the literature ones (mostly due to high O atom number density). In our case the best fit with the experimental data was achieved for the heterogeneous probabilities γ ∆ =0.0004 and γ O =0.007.…”

Recent Advances in Hollow Cathode Technology for Plasma-Enhanced ALD—Plasma Surface Modifications for Aluminum and Stainless-Steel Cathodes

“…It is to be noted that metal surfaces can also act as catalytic recombination sites for many other plasma species, so that a nitride or oxide hollow cathode surface may have an increased flux of those species compared to a bare metal surface. For instance, for an oxygen plasma, the recombination coefficient of oxygen atoms into oxygen molecules is catalyzed strongly by metal surfaces compared to oxide surfaces as shown in Table 2 by Benavides et al [106] and Table 1 by Mozetic et al [107]. It is to be noted that metal surfaces can also act as catalytic recombination sites for many other plasma species, so that a nitride or oxide hollow cathode surface may have an increased flux of those species compared to a bare metal surface.…”

“…It is to be noted that metal surfaces can also act as catalytic recombination sites for many other plasma species, so that a nitride or oxide hollow cathode surface may have an increased flux of those species compared to a bare metal surface. For instance, for an oxygen plasma, the recombination coefficient of oxygen atoms into oxygen molecules is catalyzed strongly by metal surfaces compared to oxide surfaces as shown in Table 2 by Benavides et al [106] and Table 1 by Mozetic et al [107].…”