Stimulated emission at 281.8 nm from XeBr

Abstract

Xenon with 0.10–4% Br2 was excited by an e-beam device over the range 10–3000 Torr. Stimulated emission was observed on the transition XeBr*→Xe+Br+hν (281.8 nm). Proof of laser emission and mechanistic details are discussed.

The B(1/2 2P3/2)→X(1/2 2Σ+) transition in XeBr

“…2 The essential spectroscopic features of the RgX molecules were quickly understood in terms of models which likened their ion-pair excited electronic states to the analogous alkali halide ground states and treated their valence states as essentially unbound. 1,[3][4][5][6][7][8] The strongest emission observed in high-pressure discharges was attributed to the B( 1 2 2 P 3/2 )→X( 1 2 2 ⌺ ϩ ) transition, 9 and lasing was eventually achieved on this transition in all the RgF and RgCl species for RgϭXe, Kr, and Ar.…”

Fundamentals and Current Status of Excimer Lasers

“…We can then write (4) In the second part of this equation, the first term corresponds to the ionization, the second one to the drift of the electrons and the third to the decrease of the electron density due to the diffusion process. This equation can be solved in a reference system E Figure 6.…”

“…The word excimer is now commonly used for all types of exciplexes also. First experimental results were obtained during the same year on electron beam pumped XeBr [4], KrF, XeCl and XeF [5,6]. Discharge excitation of XeF and KrF was first demonstrated in 1976 [7,8].…”

On the spin-orbit splitting of the rare gas-monohalide molecular ground state

“…The rare gas-monohalide (Rg-X) molecules have attracted considerable interest recently, because a new class of powerful UV laser systems has been built using them [1]. A lot of work has been devoted to the spectroscopy and kinetics of these systems [2,3].…”

“…While the electronically excited states have deep chemical wells, the ground states are repulsive save for a small van der Waals attraction. This combination gives diffuse emission spectra and makes the Rg-X molecules ideal candidates for excimer lasers [1][2][3][4]. It is difficult to obtain accurate information from diffuse spectra, and therefore the picture of the interaction potentials is far from complete, especially for the ground state.…”