15min:

D. FORTHOMME, C. LINTON, D. W. TOKARYK, Centre for Laser, Atomic, and Molecular Sciences and Physics Department, 8 Bailey Dr., University of New Brunswick, P.O. Box 4400, Fredericton, NB, Canada E3B 5A3; A . G. ADAM, A. D. GRANGER, Centre for Laser, Atomic, and Molecular Sciences and Chemistry Department, 30 Dineen Dr., University of New Brunswick, P.O. Box 4400, Fredericton, NB, Canada E3B 5A3.

Carbon and magnesium are abundant elements in the interstellar medium, so it is possible that carbon chain molecules containing a magnesium atom may exist in this environment\footnotemark[1].With this in mind, radical molecules of the form MgC_2nH (n = 1,2,3) have been frequent subjects of both experimental and theoretical studies. In this presentation we will discuss our high-resolution experiments of the A² -X^{2 +} transitions in the isotopologues Mg¹²C¹²CD and Mg¹³C¹³CH, which complement our earlier investigation of this spectrum in Mg¹²C¹²CH^b. The data permit us to determine the lengths of individual bonds to high precision. In addition, we have expanded on previous studies of the A² -X^{2 +} transition of Mg¹²C₄H, conducted at medium resolution. The parameters obtained from our high-resolution spectra are compared with those obtained from theoretical structure calculations.