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|Title:||Ultrafast laser studies of molecules in helium clusters|
|Supervisors:||von Haeften, Klaus|
|Presented at:||University of Leicester|
|Abstract:||We show that rotational line spectra of molecular clusters with near zero permanent dipole moments can be observed using impulsive alignment. Aligned rotational wave packets were generated by non-resonant interaction with intense femtosecond laser pump pulses and then probed using Coulomb explosion by a second, time-delayed femtosecond laser pulse. By means of a Fourier transform a rich spectrum of rotational eigenstates was derived. Guided by ab initio calculations for the smallest cluster comprising of a single acetylene molecule and a helium atom, essentially all rotational eigenstates up to the dissociation threshold could be established, providing a comprehensive picture of the rotational energy level structure. The C2H2-He complex is found to exhibit distinct features of large amplitude motion and very early onset of free internal rotor energy level structure.|
|Rights:||Copyright © the author. All rights reserved.|
|Appears in Collections:||Theses, Dept. of Physics and Astronomy|
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