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Title:
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Color center laser kinetic spectroscopy: Evidence for quasilinearity of HCCN |
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Author:
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Farhat, Shahla Khan |
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Advisor:
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Curl, R. F. |
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Degree:
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Master of Arts thesis |
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Abstract:
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The C-H stretching fundamental of the free radical HCCN has been investigated under high resolution using infrared kinetic spectroscopy. This transient molecule was produced by the flash photolysis of dibromoacetonitrile (Br$\sb2$HCCN) at 193 nm and its transient infrared absorption spectrum probed using a color center laser. Spectra of the molecule were collected between 3182 and 3274 cm$\sp{-1}$. The rotational analysis of the $\nu\sb1$ fundamental places its origin at 3246.657 cm$\sp{-1}$. Four hot bands associated with the bending vibrations have been observed; the vibrational and rotational assignment of three of these bands $\nu\sb1 + \nu\sb5 - \nu\sb5$, $\nu\sb1 + \nu\sb4 - \nu\sb4$, and $\nu\sb1 + 2\nu\sb5\sp{\pm 2} - 2\nu\sb5\sp{\pm 2}$ is definite. The $\nu\sb5$ energy was obtained by measuring the intensity of a line of the $\nu\sb1 + \nu\sb5 - \nu\sb5$ band relative to one of the fundamental and calculating the energy assuming a room temperature Boltzmann distribution. A comparison of this energy with that of quasilinear fulminic acid, HCNO, and with theoretical calculations suggests a similar floppy HCX bending potential. |
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Citation:
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Farhat, Shahla Khan. "Color center laser kinetic spectroscopy: Evidence for quasilinearity of HCCN." Masters Thesis, Rice University, ETD http://hdl.handle.net/1911/17050. |
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Citable link to this page:
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http://hdl.handle.net/1911/17050 |
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Date:
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1994 |
