Spectroscopic signatures of HHe2+ and HHe3+

Abstract

Using two different action spectroscopic techniques, a high-resolution quantum cascade laser operating around 1300 cm⁻¹ and a cryogenic ion trap machine, the proton shuttle motion of the cations HHe₂⁺ and HHe₃⁺ has been probed at a nominal temperature of 4 K. For HHe₃⁺, the loosely bound character of this complex allowed predissociation spectroscopy to be used, and the observed broad features point to a lifetime of a few ps in the vibrationally excited state. For He–H⁺–He, a fundamental linear molecule consisting of only three nuclei and four electrons, the method of laser-induced inhibition of complex growth (LIICG) enabled the measurement of three accurate rovibrational transitions, pinning down its molecular parameters for the first time.