Školitel: Juraj Fedor, ÚFCH JH AV ČR
Stav práce: volná
Anotace:
High vacuum is generally incompatible with volatile liquids, since the evaporation extremely quickly spoils the vacuum. Basically all experiments requiring vacuum are thus limited to solid samples or molecular-beam samples. This limitation can be overcome by a recently developed liquid microjet technique, where a thin jet (micrometers) of liquid is injected into vacuum. The local pressure drops rapidly with increasing distance from the jet and the liquid surface is thus exposed to a high vacuum.
The main goal of the thesis will be to do experiments on electron collisions with such microjets. This will be on one hand electron energy loss spectroscopy, which will provide information about the energetic levels inaccessible by optical spectroscopy (dark states). On the other hand, we will utilize electron impact to initiate chemical changes in the irradiated liquids and will analyze these changes by a range of analytical techniques.
Our laboratory provides a world-unique experimental infrastructure on electron spectroscopy, this project opens new directions in the field and will require great deal of experimental development. The thesis is part of the 5-year research program financed by the Czech Science Foundation EXPRO grant.
Literature:
[1] B. Winter and M. Faubel, Photoemission from Liquid Aqueous Solutions, Chem. Rev. 106 (2006) 1176.
[2] Ekimova M., Quevedo W., Faubel M., Wernet P., Nibbering E.: A liquid flatjet system for solution phase soft-x-ray spectroscopy. Struct. Dyn. 2, (2015).
[3] M. Allan, Study of triplet states and short-lived negative ions by means of electron impact spectroscopy, J. Electron Spectroscopy and Related Phenomena 48 (1989) 219.
[4] Fabrikant I. I., Eden S., Mason N. J., Fedor J.: Recent progress in dissociative electron attachment. Adv. At. Mol. Opt. Phys. 66, (2017).