Simulation of the AX and BX transition emission spectra of the InBr molecule for diagnostics in low-pressure plasmas

S Briefi (1) , U Fantz (1, 2)

1 Institut für Physik
2 IPP - Max-Planck-Institut für Plasmaphysik [Garching]

Inductively coupled low pressure discharges containing InBr have been investigated spectroscopically. In order to obtain plasma parameters such as the vibrational and rotational temperature of the InBr molecule, the emission spectra of the A 3 Π 0 + → X 1 Σ + 0 and the B 3 Π 1 → X 1 Σ + 0 transitions have been simulated. The program is based on the molecular constants and takes into account vibrational states up to v = 24. The required Franck-Condon factors and vibrationally resolved transition probabilities have been computed solving the Schrödinger equation using the Born-Oppenheimer approximation. The ground state density of the InBr molecule in the plasma has been determined from absorption spectra using effective transition probabilities for the A − X and B − X transition according to the vibrational population. The obtained densities agree well with densities derived from an Arrhenius type vapour pressure equation.

Mots clés: 52.70.Kz; 33.20.Lg; 33.20.Vq; 33.70.Ca; 33.70.Fd

S Briefi, U Fantz. Simulation of the AX and BX transition emission spectra of the InBr molecule for diagnostics in low-pressure plasmas. Journal of Physics D: Applied Physics, 2011, 44 (15), pp.155202. ⟨10.1088/0022-3727/44/15/155202⟩. ⟨hal-00609759⟩