Chemical Physics Letters, Vol.346, No.1-2, 103-111, 2001
Electric charge redistribution in BrCl resulting from interaction with Ar: the rotational spectrum of the linear complex Ar center dot center dot center dot BrCl
Ground-state rotational spectra of four isotopomers Ar . . . (BrCl)-Br-79-Cl-35, Ar . . . (BrCl)-Br-81-Cl-35, Ar . . . (BrCl)-Br-79-Cl-37 and Ar . . . (BrCl)-Br-81-Cl-37 of a complex involving argon and bromine monochloride were observed. Spectroscopic constants were interpreted on the basis of a linear species Ar . . . BrCl, with atoms in the indicated order and r(Ar . . . Br) = 3.466 Angstrom. When intermolecular electron transfer was assumed negligible, the Br and Cl nuclear quadrupole coupling constants were interpreted to show that a fraction delta (Br --> Cl) = 3.5(5) x 10(-3) of an electron is transferred from Br to Cl on complex formation. The values k(sigma) = 2.79(l) N m(-1) and k(beta beta) = 4.7(2) x 10(-20) J rad(-2) were established for the intermolecular stretching and bending quadratic force constants, respectively.