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Updated: Feb 4, 2026

Hyperpolarized Xenon for NMR and MRI Applications
Published on: September 6, 2012
Relaxation times measurement in single and multiply excited xenon clusters
P Yu Serdobintsev1, A S Melnikov2, A A Pastor1
1Saint-Petersburg State University, Saint-Petersburg, Russia.
Abstract:
Direct measurement of the rates of nonradiative relaxation processes in electronically excited xenon clusters was carried out. The clusters were created in a pulsed supersonic beam and two-photon excited by femtosecond laser pulses with a wavelength of 263 nm. The measurements were performed using the pump-probe method and electron spectroscopy. It is shown that relaxation of light clusters XeN (N < 15) predominantly occurs by desorption of excited xenon atoms with a characteristic time constant of 3 ps. Heavier electronically excited clusters (N > 10) vibrationally relax to the lowest electronically excited state at a rate of about 0.075 eV/ps. Multiply excited clusters are deactivated via energy exchange between excited centers with the ionization of one of them. The production of electrons in this process occurs with a delay of ∼4 ps from the pump pulse, and the process is completed in 10 ps.
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