Measurement of the X 2Σ+–A 2Π splitting in CsO via photoelectron spectroscopy of CsO−

Abstract

We present the photoelectron spectrum of CsO−, recorded using 2.540 eV photons. This spectrum provides a direct measurement of the X 2Σ+–A 2Π energy splitting in CsO, which is found to be 0.135±0.025 eV. This work also establishes that the ground state of CsO− is 1Σ+. In addition, the adiabatic electron affinity of CsO is found to be 0.273±0.012 eV, while the D0 value for the X 1Σ+ state of CsO− (with respect to Cs+O−) is found to be 1.84±0.15 eV. Molecular parameter estimates for CsO− are also extracted from the spectrum.

The microwave spectrum of the cesium monoxide CsO radical

“…6,9 The observed data provide us with further information on the molecular structure of the radical, as listed below.…”

“…Sarkas et al 6 determined the A -X separation in CsO to be 0.135Ϯ0.025 eV (1089Ϯ202 cm Ϫ1 ) by applying photodetachment spectroscopy to CsO Ϫ and confirmed the ground electronic state of CsO to be of 2 ⌺ ϩ . Spiker and Andrews 7,8 observed the fundamental band of CsO isolated in a nitrogen and an argon low-temperature matrix at 314 and 322 cm Ϫ1 , respectively.…”

Zinc oxide and its anion: A negative ion photoelectron spectroscopic study

“…Zinc oxide anions were generated in this experiment using a ''pick-up'' version of our hot, supersonic expansion ion source. 22 Because bulk zinc oxide decomposes upon being heated to temperatures at which it vaporizes, thermal evaporation of solid ZnO samples is not a suitable method for getting ZnO molecules into the gas phase, and no doubt, this state of affairs has impeded the experimental study of molecular ZnO in the past. Our pick-up ion source circumvented this problem by preparing ZnO Ϫ in the partially ionized gaseous environment just outside the nozzle of the source.…”

Electronic Structure of the Cesium Oxide Molecule CsO

“…These values are given in Table 1 with the available values in the literature. The comparison of our results for the constants ω e with those available in literature [ [13] shows a very good agreement by using the second basis for the states X 2 Σ + with the relative difference 2.6% ( [4]) ≤ Δω e /ω e ≤ 4.4% ( [9]); while the best agreement for the state (1) 2 Π is obtained by using the basis one with the relative difference 4.8% ( [12]) ≤ Δω e /ω e ≤ 6.8% ( [4]). By comparing our calculated values of R e with those found in literature for the 2 electronic states X 2 Σ + and (1) 2 Π, one can find an excellent agreement is obtained by using the first, fourth and fifth used basis sets with the relative differences 0.32% ( [12]) ≤ ΔR e /R e ≤ 0.37% ( [4]).…”