화학공학소재연구정보센터
Journal of Chemical Physics, Vol.105, No.22, 9733-9739, 1996
Observation and Spectroscopy of High-Lying States of the Caoh Radical - Evidence for a Bent, Covalent State
The CaOH radical has been produced in a supersonic molecular beam by the reaction of water vapor with laser desorbed calcium. Three new electronic states, the D (2) Sigma(+), E (2) Sigma(+), and F states have been observed by laser induced fluorescence and resonance enhanced multiphoton ionization spectroscopy. The D and E states are linear, but the F state is bent, the first bent and strongly covalent state of CaOH to be observed. Vibrational constants for the D state have been determined and a partially rotationally resolved spectrum has provided the rotational constant and Ca-OH bond length in this state. The D and E states are more strongly bound;than the ground state, perhaps indicating some covalent contribution to the bonding. Additional vibrational constants of the ground electronic state including the CaO-H vibrational frequency have been determined from the emission spectra.