2026-09-21T14:59:55Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/106485 2023-07-11 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

Eden, James Gary Eden, James Gary Cunningham, Brian T Li, Xiuling Lorenz, Virginia Curreli, Davide Park, Sehyun 2020-03-02T22:38:56Z 2020-03-02T22:38:56Z 2022-03-03T10:15:22Z 2019-12-05 2019-12 The dynamics of diatomic excimers - electronically excited molecules having dissociative ground states - generated in alkali-rare gas mixtures and low temperature microplasmas have been pursued and the experimental and computational results are presented here. This work focuses on the Cs-rare gas and He2 molecules that are of considerable interest as efficient near-infrared lasers, or as the energy source for driving the Hg+ vacuum-ultraviolet lamp (194.2 nm). The photoassociation and subsequent stimulated emission of cesium (Cs) - rare gas (Ar or Xe) pairs were examined by laser pump-probe experiments, and an optical-to-optical energy conversion efficiency of ~28% was observed when Cs-Ar pairs were pumped at 836.7 nm and stimulated emission occurs at 852.2 nm. By comparing full quantum simulations of Cs-Xe photoassociation to the gain spectrum of Cs-Xe in the red satellite of the Cs D2 line, it is shown that the structure of weakly bound Cs-Xe molecules (including the dissociation energy), correlated with Cs(62P3/2) + Xe(5p6 1S0) in the separated atom limit, can be determined with precision. Extensive studies of time-resolved emission from the Hg+ ion in electrically driven microplasma lamps show that the Hg+ line at 194.2 nm is pumped efficiently by Penning ionization of the Hg atom by metastable helium molecules. Experimental results as well as zero-dimensional kinetic simulations support the validity of the proposed kinetic pathway. Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2021-12-01 The student, Sehyun Park, accepted the attached license on 2019-12-04 at 13:45. The student, Sehyun Park, submitted this Dissertation for approval on 2019-12-04 at 14:05. This Dissertation was approved for publication on 2019-12-05 at 07:58. DSpace SAF Submission Ingestion Package generated from Vireo submission #14692 on 2020-02-28 at 17:37:54 Made available in DSpace on 2020-03-02T22:38:56Z (GMT). No. of bitstreams: 2 PARK-DISSERTATION-2019.pdf: 4121693 bytes, checksum: 14d71a0580fad5a25a423d6f35bc5e23 (MD5) LICENSE.txt: 4208 bytes, checksum: d61169cdc0d0f9176d01baaf4de78dc5 (MD5) Previous issue date: 2019-12-05 Embargo set by: Seth Robbins for item 114029 Lift date: 2022-03-02T22:39:04Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system Limited Restriction Lifted for Item 114029 on 2022-03-03T10:15:22Z. application/pdf http://hdl.handle.net/2142/106485 en Copyright 2019 Sehyun Park Excimer Microplasmas Alkali laser Mercury ion Helium molecule Cs-Rg Diatomic excimer dynamics in microplasma lamps and alkali lasers text text Electrical & Computer Eng Electrical & Computer Engr University of Illinois at Urbana-Champaign Dissertation Ph.D.