DESIRS beamline
ASSOCIATED PUBLICATION
Photoelectron circular dichroism on gas phase
amino acid alanine at the Lyman-
α
radiation
M. Tia, B. Cunha de Miranda, S. Daly,
F. Gaie-Levrel, G. Garcia, I. Powis and L. Nahon*
Journal of Physical Chemistry Letters, 4 (2013)
2698
*Synchrotron SOLEIL, l’Orme des Merisiers,
St Aubin BP48, 91192 Gif sur Yvette Cedex,
France
CORRESPONDING AUTHOR
➊
Time-of-Flight (TOF) spectra of alanine photoionized at 10.2 eV, with neutral species produced by aerosol
thermodesorption (black line) or resistive heating associated to an adiabatic expansion (red line). Inserts
correspond to ion images showing the Kinetic Energy Release for a few ion masses indicating for instance
that m/z 73 corresponds to a spurious decomposition product.
➋
PECD and PES measurement recorded at 10.2
eV on oven-produced D- and L-alanine. (
a
) Raw
difference images, filtered on all alanine-related
ions, showing a PECD-induced forward-backward
asymmetry with respect to the light propagation
axis (depicted by the arrow). (
b
) The corresponding
PES and
b
1
dichroic parameter distribution over the
HOMO band. The blue (resp. red) data correspond
to the D- (resp. L-) enantiomer. The filtering on the
parent mass (m/z 89) gives an asymmetry (2b
1
)
of 4%.
➌
Artist view of two enantio-enriched alanine ion
clouds separating one from the other in interstellar
space.
89
SOLEIL
HIGHLIGHTS
2013
