A nitrogen laser was constructed for use in multiphoton ionization studies. The short pulse duration and highly intense pulse make the nitrogen laser ideal for pumping a dye laser.
By using the nitrogen laser to pump a tunable dye laser, the multiphoton ionization spectrum for molecular iodine vapor was obtained for the visible spectrum between 23,188 cm-1 (430 nm) and 16, 304 cm-1 (615 nm) using pulsed electronics and a parallel plate ionization chamber. The ionization occurs in this region upon the absorption of four or five photons. The ionization appears to take place via a three-step process. The first photon excites the molecule to a resonant state which is one of the vibrational states of B3Ï€o+u level. From this level, two photons are absorbed to a higher resonant level, and then ionization takes place when that higher excited state absorbs the one or two photons necessary for ionization.
| Identifer | oai:union.ndltd.org:WKU/oai:digitalcommons.wku.edu:theses-2778 |
| Date | 01 July 1978 |
| Creators | Kintigh, James |
| Publisher | TopSCHOLAR® |
| Source Sets | Western Kentucky University Theses |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | Masters Theses & Specialist Projects |
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