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+ 11BH+ BY THE EXTRAPOLATION OF PHOTOSELECTED HIGH-RYDBERG SERIES IN 11BH.
C. RICARDO VITERI AND ANDREW T. GILKISON, Department of Chemistry, Purdue University, West Lafayette, IN 47907; SCOTT J. RIXON AND EDWARD R. GRANT, Department of Chemistry, University of British Columbia, 6174 University Boulevard, Vancouver, BC, Canada V6T 1Z3.
Optical-optical-optical triple resonance spectroscopy of 11BH isolates high-Rydberg states that form series converging to rotational state specific ionization potentials in the vibrational levels of 11BH+ from v+ = 0 through 4. Limits defined by a comprehensive fit of these series to state-detailed thresholds yield rovibrational constants describing the X2
+ state of 11BH+. The data provide a first determination of the vibration-rotation interaction parameter
e = 0.4821~cm-1 and a more accurate estimate of
e = 2526.58~cm-1 together with the higher-order anharmonic terms
exe = 61.98~cm-1 and
eye = -1.989~cm-1. The deperturbation and global fit of series to state-detailed limits also yields a precise value of the adiabatic ionization potential of 11BH of 79120.3(1)~cm-1, or 9.81033(1)~eV. High precision is afforded here by the use of graphical analysis techniques, narrow bandwidth laser systems, and an analysis of newly observed, high-principal quantum number Rydberg states that conform well with a Hund's case (d) electron-core coupling limit.