Study of Emission Spectra of Cl-, Br-, and I-Containing Targets in the 3‒6.5 nm Spectral Range under Pulsed Laser Irradiation

• Published in: Bulletin of the Lebedev Physics Institute Vol. 50; no. Suppl 9; pp. S1042 - S1049
• Main Authors: Guseva, V. E., Garakhin, S. A., Nechai, A. N., Perekalov, A. A., Tsybin, N. N., Chkhalo, N. I.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.12.2023; Springer Nature B.V
• Subjects: Bromine; Effect of Laser Radiation on Matter; Emission analysis; Emission spectra; Half spaces; Multilayers; Neodymium lasers; Physics; Physics and Astronomy; Pulsed lasers; Radiant flux density; Semiconductor lasers; YAG lasers; extreme ultraviolet radiation; emission spectra; gas jets; soft X-rays; laser spark
• ISSN: 1068-3356; 1934-838X
• DOI: 10.3103/S1068335623210054

We describe results of studying emission spectra of Cl-, Br-, and I-containing liquid jet targets in the 3‒6.5 nm wavelength range under their excitation by a pulsed laser. A number of emission lines of Cl, Br, and I ions are recorded, including in the “water-window” spectral range of 2.3‒4.4 nm. A specially developed system based on an industrial pulse valve is used for a liquid-jet target to be formed. The targets are excited by an Nd:YAG laser (λ = 1064 nm, τ = 5.2 ns, E pulse = 0.8 J). Using a Bragg spectrometer based on a multilayer X-ray Cr/Sc mirror and Ti/Be absorption filters, absolute intensities of some of the most intense lines are measured. High emissivity of liquid targets is demonstrated; thus, for a bromine-containing target in the 6.12 ± 0.05 nm band, the resulting radiation intensity in the half-space is 1.3 × 10 13 photons per pulse.