Eur. Phys. J. D 63, 183-187 (2011)
https://doi.org/10.1140/epjd/e2011-10525-6

Optical absorption spectrum of the silver dimer ion: temperature dependence measured by photodissociation and photon-trap spectroscopy

¹ East Tokyo Laboratory, Genesis Research Institute, Inc., 717–86 Futamata, Ichikawa, Chiba 272-0001, Japan
² Cluster Research Laboratory, Toyota Technological Institute in East Tokyo Laboratory, Genesis Research Institute, Inc., 717–86 Futamata, Ichikawa, Chiba 272-0001, Japan

^d e-mail: terasaki@chem.kyushu-univ.jp

Received: 18 September 2010
Received in final form: 19 February 2011
Published online: 17 May 2011

Abstract

The optical absorption spectrum is reported for the silver dimer cation, Ag₂⁺, which is temperature-controlled by buffer-gas cooling in an ion trap. The measurement is performed by two methods, photodissociation and photon-trap spectroscopy. The temperature of the trapped ions is estimated from the profiles of the spectrum. The spectrum is further analyzed to evaluate the bond length, r_e, the vibrational frequency, ω_e, and the anharmonic constant, ω_ex_e, in the first excited electronic state based on the molecular parameters reported for the ground state. Absorption and dissociation cross sections are compared as well.