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V Encuentro Sud Americano de Colisiones Inelásticas en la Materia
tions of single electron loss processes (capture
and ionization) for collisions between multiply
charged ions, namely, H + , He 2+ and C 6+ (with
impact energies ranging from 10 keV/amu to
10 MeV/amu) and DNA/RNA bases [12-13]. To
the best of our knowledge the second group of
“quantum mechanical approaches” is only represented
by the recent work of Dal Cappello et al.
[14] where differential and total ionization cross
sections have been reported for protons impinging
on cytosine molecules. However, the obtained
total cross sections exhibited large discrepancies
in magnitude as well as in shape with
our recent CTMC predictions [13], these later
showing nevertheless a very good agreement
with semi-classical results obtained by using the
simple Rutherford formula proposed by Stolterfoht
et al. [15].
In the present work, quantum-mechanical
and classical calculations of doubly and singly
differential as well as total cross sections are
presented for ionization and capture processes
induced by proton, α-particle and bare ion
carbon beams impacting on adenine, cytosine,
thymine and guanine bases.
TCS (10 -16 cm 2 )
1 0 2
1 0 1
1 0 0
C B 1
1 0 -1
a ) H +
+ A d e n in e
C D W - E IS
C T M C - C O B
e x p e r im e n ta l
1 0 2 c ) H + + T h ym in e
b ) H +
+ C y to s in e
d ) H +
+ G u a n in e
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1 0 1
1 0 0
1 0 -1
1 0 1 1 0 2 1 0 3 1 0 4 1 0 15
1 0 2 1 0 3 1 0 4 1 0 5
In c id e n t p ro to n e n e rg y (k e V /u )
Figure 1. Total ionization cross sections (10 -16 cm 2 )
for the four DNA bases here investigated, namely,
adenine (panel a), cytosine (panel b), thymine (panel
c), and guanine (panel d) impacted by protons.
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