Change In Total Angular Momentum Within The Z3F0 Titanium Excited State Induced By Collisions With Hydrogen And Nitrogen Molecules

Collisions that produce a change in the total angular-momentum and quenching processes involving thetripletZ 3 F 0titanium excited level and diatomic molecules have been studied by laser perturbation andtime-resolved spectroscopy. The thermally averaged total angular-momentum changing cross sections ( z 3 F i 0 → z 3 F j 0 )in units of10 − 16cm 2   are:   σ ¯ 42 = 3.2 ± 1 ,   1.4 ± 0.5 ;   σ ¯ 43 = 13.3 ± 2 ,   6.8 ± 1 ;   σ ¯ 32   = 19.0 ± 2 ,   7.2 ± 1 , respectively, for nitrogen and hydrogen colliding partners. Large quenching cross sections are obtained, asσ − Q N 2= 53 ± 7 , andσ − Q H 2= 38 ± 4 in units of 10 -16 cm 2 .These results are discussed in relation with previous measurements dealing with titanium-noble-gascollisions, and with available published results.