Laser Excitation Spectroscopy of the A 3 Piu -X ; 3 Sigmag - Transition of the NCN Radical
The (010)-(010) band of the A 3 Piu -X ; 3 Sigmag - transition of the NCN radical at 328 nm has been reexamined at Doppler-limited resolution by laser excitation spectroscopy. The molecule was generated in a microwave discharge through N2 and CF4 in helium. Both the 3 Deltag -3 Piu and the 3 Sigmag +/- -3 Piu vibronic components of the transition have been observed and rotationally analyzed. The Renner-Teller parameter, varepsilonomega2 , for NCN in the excited A 3 Piu state is determined to be -91.1213(16) cm-1 . Estimates for the ground and excited state bending vibrational wavenumbers of 437.7(14) and 533.95(70) cm-1 respectively have been obtained.
Beaton
SA
The Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford, OX1 3QZ, United Kingdom
Brown
JM