<p> An experimental study of vibrational energy transfer
in ortho and para NH3(v2) is presented. The vibrational
relaxation rates are necessary to characterize mid-IR pulsed
and cw NH3 lasers, and the interpretation of these rates is
of theoretical importance. Accurate information on the
(V-T) process in NH3/N2 mixtures and the (V-V) energy
transfer between ortho and para 15NH3 and 14NH3 is now
available. </p> <p> First, NH 3 linestrengths and linewidths were
accurately measured with a tunable diode laser (TDL) so
that ammonia concentrations could be calculated from TDL
scans. The energy transfer mechanisms were studied by
exciting the v2 vibration of NH3 with a Q-switched cO2 laser
and probing the subsequent changes in population with a TDL.
A difference in v 2 lifetimes was observed between ortho and
para NH3 transitions, and is explained by a (V-V) transfer of
energy between the NH3 species. An isolated ortho 15NH3
absorption line was pumped and vibrational transfer of
energy was observed to ortho and para 14NH3 and 15NH3. </p> / Thesis / Master of Science (MSc)
| Identifer | oai:union.ndltd.org:mcmaster.ca/oai:macsphere.mcmaster.ca:11375/19278 |
| Date | 09 1900 |
| Creators | Danagher, David |
| Contributors | Reid, John, Physics |
| Source Sets | McMaster University |
| Language | English |
| Detected Language | English |
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