TY - JOUR
T1 - Experimental Characterization of the Higher Vibrationally Excited States of HCO+
T2 - Determination of ω2, x22, g22, and B(030)
AU - Foltynowicz, Robert J.
AU - Robinson, Jason D.
AU - Zückerman, Eric J.
AU - Hedderich, Hartmut G.
AU - Grant, Edward R.
N1 - Funding Information:
We are grateful to S. H. Ashworth and J. M. Brown of Rutherford Appleton Laboratory for sending a copy of Atlas for Optogalvanic Transitions in Neon. This work was supported by the Director, Office of Energy Research, Office of Basic Energy Sciences, Chemical Science Division of the U.S. Department of Energy under Contract No. DE-FG02-93ER14401.
PY - 2000/2
Y1 - 2000/2
N2 - Analyses of high Rydberg series of HCO converging to the (030) vibrational state of the cation establish rovibrational state-detailed thresholds for HCO+. UV-visible laser double resonance isolates series for assignment. Strongly vertical Rydberg-Rydberg transitions from photoselected N′ = O and N′ = 2 rotational levels of the ∑- Renner-Teller vibronic component of the 3pπ 2Π (030) complex define individual series converging to rotational levels, N+ = 1 through 5 and 3 through 5 of the HCO+ vibrational states (0310) and (0330), respectively. Extrapolation of autoionizing series locates the positions of these rovibrational states to within ±0.01 cm-1. The use of this information combined with precise ionization limits for lower vibrational states determined from earlier Rydberg extrapolations and spectroscopic information available from infrared absorption measurements enables an estimate of the force-field parameters for HCO+ bending. These parameters include the harmonic bending frequency, ω2 = 842.57 cm-1, the vibrational angular momentum splitting constant, g22 = 3.26 cm-1, and the diagonal bending anharmonicity, x22 = -2.53 cm-1, separated from the off-diagonal contribution, x22, by reference to ab initio calculations. Results of experiment on the higher vibrationally excited states of HCO+ are compared with recent theoretical predictions.
AB - Analyses of high Rydberg series of HCO converging to the (030) vibrational state of the cation establish rovibrational state-detailed thresholds for HCO+. UV-visible laser double resonance isolates series for assignment. Strongly vertical Rydberg-Rydberg transitions from photoselected N′ = O and N′ = 2 rotational levels of the ∑- Renner-Teller vibronic component of the 3pπ 2Π (030) complex define individual series converging to rotational levels, N+ = 1 through 5 and 3 through 5 of the HCO+ vibrational states (0310) and (0330), respectively. Extrapolation of autoionizing series locates the positions of these rovibrational states to within ±0.01 cm-1. The use of this information combined with precise ionization limits for lower vibrational states determined from earlier Rydberg extrapolations and spectroscopic information available from infrared absorption measurements enables an estimate of the force-field parameters for HCO+ bending. These parameters include the harmonic bending frequency, ω2 = 842.57 cm-1, the vibrational angular momentum splitting constant, g22 = 3.26 cm-1, and the diagonal bending anharmonicity, x22 = -2.53 cm-1, separated from the off-diagonal contribution, x22, by reference to ab initio calculations. Results of experiment on the higher vibrationally excited states of HCO+ are compared with recent theoretical predictions.
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U2 - 10.1006/jmsp.1999.8014
DO - 10.1006/jmsp.1999.8014
M3 - Article
AN - SCOPUS:0000382086
VL - 199
SP - 147
EP - 157
JO - Journal of Molecular Spectroscopy
JF - Journal of Molecular Spectroscopy
SN - 0022-2852
IS - 2
ER -