Visible Wavelength Emission Spectroscopy Following the 266 nm Photolysis of Iodomethanes
| Autor: | Sin-hua Yang, 楊欣樺 |
|---|---|
| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 266 nm laser photolysis of CH2I2 and CH3I were conducted in a slow flow cell. Previous results show that this photolysis produces several unknown bands in the nascent emission spectrum at visible wavelengths. In this study, a high sensitivity intensified charge-couple device (ICCD) detector was employed for recording better nascent emission spectra from near-infrared to visible wavelengths with the improvement on signal-to-noise ratios of at least a factor of 3. Frequencies, bandwidths, and waveforms of these unknown bands provide the data basis for analysis. Emission spectra under different pressures and those at different delay times were also acquired. These results indicate that the unknown bands are a series of emission bands that originate from the same upper level to different lower levels. The ground state vibrational parameters are determined to be: ω1= 434.9±0.6 cm-1 and ω2= 220±3 cm-1. The possible carrier molecule of these unknown bands could be therefore identified. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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