Multipronged mapping to the dynamics of a barium atom deposited on argon clusters

Abstract

The dynamics of an electronically excited barium atom deposited at the surface of an Ar cluster was explored in a multipronged approach which associates information from frequency-resolved nanosecond experiments and information from femtosecond time-resolved experiments. In both types of experiments, the dynamics is monitored by photoelectron and photoion spectroscopy.

Unravelling the full relaxation dynamics of superexcited helium nanodroplets

“…This suggests the existence of a relaxation channel to the 1s2s 3 S state from states below the droplet ionization potential as well. We mention that spin quenching was previously observed for barium atoms attached to the surface of argon clusters 57 . However, adding such a relaxation channel to the rate model does not improve the correlation between model and data.…”

“…In this way, aspects of the relaxation dynamics that are specific to the quantum fluid properties of He droplets could be identified. Furthermore, multiply-excited and doped clusters/nanodroplets present additional rich phenomenology 44,57,65 to be explored using the new XUV and X-ray sources that are nowadays available.…”

Time-Resolved Observation of the Solvation Dynamics of a Rydberg Excited Molecule Deposited on an Argon Cluster. II. DABCO☆ at Long Time Delays

“…With a backing pressure of 16 bar in the nozzle source, the average size of the clusters is estimated to be Ar ≈500 . 18 The cluster beam exits the source chamber through a skimmer and enters into the pick-up chamber. A needle is used to fill the latter chamber with a low pressure of DABCO molecules, which are picked-up collisionally by the argon clusters.…”

“…The beam carrying argon clusters is generated by supersonic expansion through a 100 μm nozzle, using a pulse valve (First Sensor Series 9) operating at 20 Hz. With a backing pressure of 16 bar in the nozzle source, the average size of the clusters is estimated to be Ar ≈500 …”

Pickup and reactions of molecules on clusters relevant for atmospheric and interstellar processes

“…[24][25][26][27][28][29] The CICR technique has been further exploited for investigations of reactions, 30 spectroscopy, 31 photoinduced Ca + HBr and Ca + CH 3 F reactions 32,33 or more recent investigation of solvation dynamics. 34,35 The rare gas clusters were also implemented in the investigation of the solvent effect on the a J. Heyrovský Institute of Physical Chemistry, v.v.i., The Czech Academy of Sciences, photodissociation dynamics in Buck's group, where the molecules were deposited in the clusters and dissociated by UV lasers. [36][37][38] Our present work, in a sense, follows up on the CICR methodology, and extends it towards applications in atmospheric and interstellar chemistry.…”