Emission Spectroscopy of IF $A^{3}\Pi(1)$: Medium Resolution Vibrational Analysis
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Date
1986
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Ohio State University
Abstract
Chemiluminescence emission has been observed from IF in a flow of $I_{2}$ and $F_{2}$ at a cell temperature of $400^{\circ}$C. Spectra have been recorded under medium resolution from 470 to 750 nm, and structure originating from the $A^{3}\Pi(1)$ state and terminating in the ground, $X\Sigma^{+}$ state has been observed. Bandheads in progressions based on $0 \le v^{\prime} \le 15$ and $0 \le v^{\prime\prime} \le 5$ have been measured and assigned. A new vibrational numbering for the A state is proposed which leads to improved molecular constants: $\tau_{e} = (14936\pm 2)cm^{-1}, w_{e} = (386.3 \pm 0.8)cm^{-1}, w_{e}x_{e} = (2.51 \pm 0.11) cm^{-1}, w_{e}z_{e} = (-0.056 \pm 0.005) cm^{-1}, D_{e} = (7884 \pm 300) cm^{-1}$. The IF(A) emission showed a strong dependence on cell temperature with the most prominent features appearing at $400-500^{\circ}$C. These results are explained on the basis of the rapidity of electronic quenching at the lower cell temperatures.
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Address of McFeeters: Advanced Chemical Laser Branch, Air Force Weapons Laboratory, Kirtland AFB, New Mexico 87117-6008. Address of Wolf: Defense Nuclear Agency, Shock Physics and Aerospace Systems, Washington, D.C. 20305-1000
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