Photochemistry and spectroscopy of small hydrated magnesium clusters Mg⁺(H₂O)_n, n = 1-5.

ABSTRACT: Hydrated singly charged magnesium ions Mg⁺(H₂O)_n, n ≤ 5, in the gas phase are ideal model systems to study photochemical hydrogen evolution since atomic hydrogen is formed over a wide range of wavelengths, with a strong cluster size dependence. Mass selected clusters are stored in the cell of an Fourier transform ion cyclotron resonance mass spectrometer at a temperature of 130 K for several seconds, which allows thermal equilibration via blackbody radiation. Tunable laser light is used for photodissociation. Strong transitions to D_1-3 states (correlating with the 3s-3p_x,y,z transitions of Mg⁺) are observed for all cluster sizes, as well as a second absorption band at 4-5 eV for n = 3-5. Due to the lifted degeneracy of the 3

SUBMITTER: Oncak M 

PROVIDER: S-EPMC7075709 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature