Formation of coherent rotational wavepackets in small molecule-helium clusters using impulsive alignment
Gediminas Galinis
(1)
,
L.G. Mendoza Luna
(1)
,
Mark Watkins
(1)
,
A. M. Ellis
(1)
,
Russell S. Minns
(2)
,
M. Mladenovic
(3)
,
Marius Lewerenz
(3)
,
Richard T. Chapman
(4)
,
I. C. Edmond Turcu
(4)
,
Cephise Cacho
(4)
,
E. Springate
(4)
,
L. Kazak
(5)
,
Sebastian Goede
(5)
,
R. Irsig
(5)
,
Slawomir Skruszewicz
(5)
,
J. Tiggesbaumker
(5)
,
K.-H. Meiwes-Broer
(5)
,
A. Rouzee
(6)
,
J. E. Underwood
(7)
,
Marco Siano
(8)
,
Klaus von Haeften
(1)
1
University of Leicester
2 University of Southampton
3 MSME - Laboratoire de Modélisation et Simulation Multi Echelle
4 RAL - STFC Rutherford Appleton Laboratory
5 University of Rostock
6 MBI - Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie
7 UCL - University College of London [London]
8 Imperial College London
2 University of Southampton
3 MSME - Laboratoire de Modélisation et Simulation Multi Echelle
4 RAL - STFC Rutherford Appleton Laboratory
5 University of Rostock
6 MBI - Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie
7 UCL - University College of London [London]
8 Imperial College London
M. Mladenovic
- Fonction : Auteur
- PersonId : 934821
Marius Lewerenz
- Fonction : Auteur
- PersonId : 934822
Résumé
We show that rotational line spectra of molecular clusters with near zero permanent
dipole moments can be observed using impulsive alignment. Aligned rotational
wavepackets were generated by non-resonant interaction with intense femtosecond
laser pump pulses and then probed using Coulomb explosion by a second, timedelayed
femtosecond laser pulse. By means of a Fourier transform a rich spectrum of
rotational eigenstates was derived. For the smallest cluster, C2H2–He, we were able
to establish essentially all rotational eigenstates up to the dissociation threshold on
the basis of theoretical level predictions. 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.