Kinetic study of the reaction of Rh(a4F9/2) with N2O, O2 and NO

The gas phase reactivity of Rh(a(4)F(9/2)) with N2O, O-2 and NO is reported. Removal rate constants for the excited stares of rhodium below 13,000 cm(-1) are also reported. The reaction rate of Rh(a(4)F(9/2)) with N2O is relatively temperature insensitive. The rate constants for the bimolecular reaction are described in Arrhenius form by (1.3 +/- 0.3) x 10(-12) exp (-1.3 +/- 0.8 kJ/mol/RT) cm(3) s(-1). The reaction rates of the a(4)F(9/2) stale with O-2 and NO are pressure dependent. For O-2, the limiting low pressure third-order, k(0), and limiting high-pressure second-order, k(infinity), room temperature rate constants in argon buffer are (6.6 +/- 0.6) x 10(-30) cm(6) s(-1) and (2.1 +/- 0.2) x 10(-11) cm(3) s(-1), respectively. For NO, k(0) and k(infinity) are (1.3 +/- 0.2) x 10(-30) cm(6) s(-1) and (1.2 +/- 0.4) x 10(-11) cm(3) s(-1), respectively. The removal rates of the excited states are faster than the ground state by a factor of 2 or more.