LASER EXCITATION SPECTROSCOPY: AN ANALYTICAL TOOL FOR STUDYING ENERGY TRANSFER MECHANISMS IN KXe AND OTHER GAS MIXTURES
Desai, Kavita V.
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ML06_1.pptx
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https://hdl.handle.net/2142/122451
Description
Title
LASER EXCITATION SPECTROSCOPY: AN ANALYTICAL TOOL FOR STUDYING ENERGY TRANSFER MECHANISMS IN KXe AND OTHER GAS MIXTURES
Author(s)
Desai, Kavita V.
Contributor(s)
Eden, J. Gary
Mironov, Andrey E.
Issue Date
2023-06-19
Keyword(s)
Spectroscopy as an analytical tool
Abstract
Laser excitation experiments were conducted to study the energy transfer mechanisms in K-Xe mixtures with narrowband dye lasers. Specifically, the K-Xe gas mixture was excited by a tunable dye laser in the vicinity of the K D₂ line such that a population inversion on the K D₁ line was achieved. The second dye laser served as the probe and scanned around the K D₁ transition. Through these experiments, the amplified probe energy is measured and the pump gain profile is obtained as shown in the spectra. The obtained data suggests than an electronic and molecular stimulated Raman scattering (SRS) process occur and compete in KXe in addition to a broad pump absorbance for emission on the K D₁ line. The Raman shift associated with the molecular SRS process of ~59 cm⁻¹ is associated with the KXe B²Σ½⁺ and the dissociative X²Σ½⁺ interatomic potentials. Consequently, the B²Σ½⁺ and X²Σ½⁺ interatomic potentials of KXe at large R can be determined by comparing experiment with calculations of the Franck-Condon integrals and quasi-static line-broadening theory.
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6684.pdf
ML06_1.pptx
