Accession Number : ADA258850


Title :   Electronic-to-Vibrational Energy Transfer from Br* to CO2 and Electronic-to- Vibrational Laser Feasibility Studies.


Descriptive Note : Master's thesis,


Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING


Personal Author(s) : Katapski, Steven M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a258850.pdf


Report Date : Nov 1992


Pagination or Media Count : 64


Abstract : The energy transfer mechanism from photo-excited bromine atoms (Br(2P sub 1/2)) to C02 is investigated in a pulsed fluorescence experiment. An excimer-pumped pulsed dye laser operating at 480 nm is used to photolyze molecular bromine, resulting in the creation of one excited state bromine atom, Br(2P sub 1/2), and one ground state atom, Br(2P sub 3/2). The electronically- excited bromine atoms (referred to as Br*) collide with and excite vibrational modes in the ground electronic state of CO2. Measurements are made of the Br* lifetimes and associated quenching processes, and the electronic-to-vibrational (E yields V) energy transfer rate from Br* to CO2. The feasibility of subsequent stimulated emission from the CO2 on the (101)-(100)(4.3 micron) transition is studied, and attempts are made to achieve lasing. Limitations of the experimental apparatus prevented achieving stimulated emission on the 4.3 micron transition. Recommendations are made for improvements in the analysis and apparatus for further research.


Descriptors :   *MOLECULAR VIBRATION , *ENERGY TRANSFER , *ELECTRONIC STATES , EMISSION , ORBITS , EXCITATION , GROUND STATE , ATOMIC SPECTROSCOPY , EXCIMERS , SPIN STATES , BROMINE , CARBON DIOXIDE , DYE LASERS , QUENCHING , ATOMS , THESES , MEASUREMENT , FLUORESCENCE


Subject Categories : Lasers and Masers
      Atomic and Molecular Physics and Spectroscopy
      Optics


Distribution Statement : APPROVED FOR PUBLIC RELEASE