Abstract: | The
2A1 →
2E emission spectrum of CH3CP+ in the gas phase has been observed in the 530–590 nm region. The cations were produced by electron impact on either an effusive beam or seeded helium supersonic free jet or CH3CP. Two pairs of spin-orbit separated bands are identified: O00,
OO and 2O1,
O1. The derived constants are (in cm−1): T0=18656(1), a″O=−85(2) and ν″2=1503(2). |