TY  - JOUR
A1  - Liu, Ji-Cai
A1  - Ignatova, Nina
A1  - Kimberg, Victor
A1  - Krasnov, Pavel
A1  - Föhlisch, Alexander
A1  - Simon, Marc
A1  - Gel'mukhanov, Faris
T1  - Time-resolved study of recoil-induced rotation by X-ray pump - X-ray probe spectroscopy
T2  - Physical chemistry, chemical physics : a journal of European Chemical Societies
N2  - Modern stationary X-ray spectroscopy is unable to resolve rotational structure. 
In the present paper, we propose to use time-resolved two color X-ray pump-probe spectroscopy with picosecond resolution for real-time monitoring of the rotational dynamics induced by the recoil effect. 
The proposed technique consists of two steps. 
The first short pump X-ray pulse ionizes the valence electron, which transfers angular momentum to the molecule. 
The second time-delayed short probe X-ray pulse resonantly excites a 1s electron to the created valence hole. 

Due to the recoil-induced angular momentum the molecule rotates and changes the orientation of transition dipole moment of core-excitation with respect to the transition dipole moment of the valence ionization, which results in a temporal modulation of the probe X-ray absorption as a function of the delay time between the pulses. 
We developed an accurate theory of the X-ray pump-probe spectroscopy of the recoil-induced rotation and study how the energy of the photoelectron and thermal dephasing affect the structure of the time-dependent X-ray absorption using the CO molecule as a case-study. 
We also discuss the feasibility of experimental observation of our theoretical findings, opening new perspectives in studies of molecular rotational dynamics.
Y1  - 2022
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/64193
SN  - 1463-9076
SN  - 1463-9084
VL  - 24
IS  - 11
SP  - 6627
EP  - 6638
PB  - Royal Society of Chemistry
CY  - Cambridge
ER  -