Chemical Physics Letters, Vol.318, No.6, 529-535, 2000
Efficient production of vibrationally excited NO using a pulsed molecular beam discharge source
An efficient way of producing vibrationally excited, but rotationally cold NO molecules is described. A de-discharge is incorporated into a piezoelectric pulsed molecular beam valve of the Gerlich design. Efficiencies larger than 10% are achieved for the production of vibrationally excited NO(v " = 1) characterized by a rotational temperature of 4 K. At lower backing pressures, a population ratio NO(v " = 1)/NO(v " = 0)= 0.5 is found with rotational temperatures around 30 K. Population of NO in higher vibrational states, e.g. v " = 2, is generated with smaller but still significant density. Even highly vibrationally excited NO molecules with 7 less than or equal to v " less than or equal to 19 have been detected.