High resolution photofragment spectroscopy of the gas phase methyl iodide ion |
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Authors: | Chen Lingbing H Figger W Quint |
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Institution: | 1. Max-Planck-Institut für Quantenoptik, D-8046, Garching, Federal Republic of Germany
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Abstract: | Photodissociation spectra of the molecular ion CH3I+ were obtained with a three stage quadrupole mass spectrometer. Starting from the \(\tilde X^2 E_{3/2} \) ground state, theà 2 E 1/2 state was excited with a stilbene 3 cw dye laser. This state predissociates to CH + 3 +I. Measuring the intensity of the CH + 3 fragment ions as a function of the wavelength of the exciting laser, a spectrum showing vibrational and rotational structure was obtained. The vibrational structure was assigned to three progressions ofv 3 and new vibrational frequencies were determined. From a computer simulation of the (0, 1, 10) band rotational constants were derived. In particular, their dependence on the vibrationv 3 was studied. |
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