OBSERVATION OF THE AUTOIONIZING GERADE TRIPLET RYDBERG SERIES IN $H_{2}$
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Date
1985
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Ohio State University
Abstract
We have observed the autoionizing gerade Rydberg ns and nd series in molecular hydrogen. A frequency doubled tunable YAG-pumped dye laser beam is used to excite the fast beam of $H_{2}(e^{3}\Pi_{4})$ to the ns, nd Rydberg states. Excitation to the Rydberg states is detected by separating the autoionization product, i.e., $H^{+}_{2}$, from the neutral beam and counting it. The observed autoionization has a large number of closly spaced lines since four gerade electronic series are accesible from 16 vibrational levels of the c state. We have scanned the dye laser with a linewidth of $0.6 cm^{-1}$ from 3360 to 3580 \AA covering the Rydberg series from n = 10 to the continues for $\Delta v = 0$ transitions. A smaller portion of the spectrum at the dye laser linewidth of $0.1 cm^{-1}$ reveals the fine structure of the c state. A preliminary analysis of the term energies indicates that lines with n as high as 34 are discernable in the spectra. We are at present attempting a detailed assignment using MQDT. Supported by the National Science Foundation
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Author Institution: Molecular Physics Department, Chemical Physics Laboratory, SRI International; Molecular Physics Department, Chemical Physics Laboratory, SRI International