Abstract book - Prof. Per Jensen, Ph.D. - Bergische Universität ...

202 Poster session, J39Rotational analysis of the E 1 Π – A 1 Π system of AlHW. Szajna 1 , R. Hakalla 2 , M. Zachwieja 3 ,I. Piotrowska 4 , M. Ostrowska-Kopeć 5 , P. Kolek 6 , R. Kępa 71,2,3,4,5,6,7 Atomic and Molecular Physics Laboratory, Institute of Physics,University of Rzeszów, 35-310 Rzeszów, POLAND1 szajna@univ.rzeszow.pl, 2 hakalla@univ.rzeszow.pl, 3 zachwiej@univ.rzeszow.pl,4 ipiotrowska@if.univ.rzeszow.pl, 5 mostrow@univ.rzeszow.pl,6 kolek@if.univ.rzeszow.pl, 7 krepa@univ.rzeszow.pl,Szajna W.Hakalla R.Zachwieja M.Piotrowska I.Ostrowska-Kopec M.Kolek P.Kepa R.The emission spectrum of the E 1 Π – A 1 Π system of the AlH molecule wasreinvestigated in the spectral region of about 29 000 cm -1 by using a high accuracydispersive optical spectroscopy. The AlH molecules were formed and excited in analuminium hollow-cathode lamp with two anodes, filled with a mixture of Ne buffer gasand a trace of NH 3 . The emission from the discharge was observed with a plane gratingspectrograph and recorded by a photomultiplier tube. The full rotational structure of the0-0 band was precisely measured end rotationally analyzed. The new data wereelaborated with help of recent A 1 Π state parameters reported by Szajna et al. 1 For theE 1 Π, υ = 0 state a considerable irregularities of the Λ-doubling have been observed. Themost reasonably explanation for this anomaly is perturbing of the e component of theE 1 Π state by the lying above and unobserved so far 1 Σ + state, as it was suggested byJohns 2 . Simultaneously, the f component of the E state was observed to be quite regularup to the observed rotational level. For the reason mentioned above the individual bandfit was done by means of the least-squares method suggested by Curl and Dane 3 andWatson 4 . In the linear upper E 1 Π, υ = 0 state model the terms values served as the fittedparameters, while the lower state A 1 Π, υ = 0, was represented by the effectiveHamiltonian proposed by Brown et al. 5 In this way precise values of the rotational termsof E 1 Π, υ = 0 state were obtained. Also main rotational constants for the f component ofE 1 Π, υ = 0 state were calculated from usual Hamiltonian method 5 .Fig. 1: Part of the rotational structure of the 0-0 band of the E 1 Π – A 1 Π system of AlH.References[1] W. Szajna, M. Zchiwieja, R. Hakalla, R. Kępa, Acta Phys. Pol. A, 120, 417, 2011.[2] A. Lagerquist, L. E. Lundh, H. Neuhaus, Phys. Scripta, 1, 261, 1970.[3] R.F. Curl, C.B. Dane, J. Mol. Spectrosc., 128, 406, 1988.[4] J.K.G. Watson, J. Mol. Spectrosc., 138, 302, 1989.[5] J.M. Brown, E.A. Colbourn, J.K.G. Watson, F.D. Wayne, J. Mol. Spectrosc., 74,294, 1979.