Structure Data of Free Polyatomic Molecules
211
IR
HHeO+
State
υ=0
υ1=1
υ1=υb=1
Oxoniumylidene – helium (1/1)
(weakly bound complex)
Rcm [Å] a)
2.6018(2)
2.5761(1)
2.5911(7)
r(H…He) [Å] a)
1.6230(2)
1.5748(1)
1.5898(7)
θ [deg] a) b)
C∞v
(effective symmetry class)
(large-amplitude motion)
OH+ ⋅ He
24.7(2)
21.3(2)
39.5(3)
The linear H-bound structures in the 3Σ− electronic ground state were determined from
the IR predissociation spectra of the ν1 (O−H stretch) and its combination band with the
intermolecular vibration (ν1+νb). The geometry of the OH+ subunit was assumed to be
unchanged upon complexation.
a
) Estimated standard errors.
) Angular oscillation of the OH+ subunit.
b
Roth, D., Nizkorodov, S.A, Maier, J.P., Dopfer, O.: J. Chem. Phys. 109 (1998) 3841.
Landolt-Börnstein
New Series II/28A