We present results about dissociative electron attachment (DEA) to gas-phase uracil (U) for incident electron energies between 0 and 14 eV using a crossed electron/molecule beam apparatus. The most abundant negative ion formed via DEA is where the resonance with the highest intensity appears at 1.01 eV. The anion yield of shows a number of peaks, which can be explained in part as being due to the formation of different isomers. Our results are compared with high level ab initio calculations using the G2MP2 method. There was no measurable amount of a parent ion We also report the occurrence of 12 other fragments produced by dissociative electron attachment to uracil but with lower cross sections than In addition we observed a parasitic contaminating process for conditions where uracil was introduced simultaneously with calibrant gases and that leads to a sharp peak in the cross section close to 0 eV. For and all other fragments we determined rough measures for the absolute partial cross section yielding in the case of a peak value of σ
REFERENCES
1.
W. Dekant and S. Vamvakas, Toxikologie (Spektrum Akademischer Verlag, Heidelberg, 1994).
2.
A. L. Lehninger, Biochemistry (Worth, New York, 1970).
3.
4.
C. M.
DeLara
, T. J.
Jenner
, K. M. S.
Townsend
, S. J.
Marsden
, and P.
O’Neill
, Radiat. Res.
144
, 43
(1995
).5.
J. K.
Wolken
, E. A.
Syrstad
, S.
Vivekananda
, and F.
Turicek
, J. Am. Chem. Soc.
123
, 5804
(2001
).6.
M.
Folkard
, K. M.
Prise
, B.
Brocklehurst
, and B. D.
Michael
, J. Phys. B
32
, 2753
(1999
).7.
B.
Boudaiffa
, P.
Cloutier
, D.
Hunting
, M. A.
Huels
, and L.
Sanche
, Science
287
, 1658
(2000
).8.
1. International Commission on Radiation Units and Measurements, ICRU Report 31 (ICRU, Washington, DC, 1979).
9.
V.
Cobut
, Y.
Fongillo
, J. P.
Patau
, T.
Goulet
, M.-J.
Fraser
, and J.-P.
Jay-Gerin
, Radiat. Phys. Chem.
51
, 229
(1998
).10.
J. E.
Aldrich
, K. Y.
Lam
, P. C.
Shragge
, and J. W.
Hunt
, Radiat. Res.
63
, 42
(1975
).11.
B.
Coupier
, B.
Farizon
, M.
Farizon
, et al., Eur. Phys. J. D
20
, 459
(2002
).12.
G.
Hanel
, B.
Gstir
, S.
Denifl
, P.
Scheier
, M.
Probst
, B.
Farizon
, M.
Farizon
, E.
Illenberger
, and T. D.
Märk
, Phys. Rev. Lett.
90
, 188104
-1
(2003
).13.
M. A.
Huels
, I.
Hahndorf
, E.
Illenberger
, and L.
Sanche
, J. Chem. Phys.
108
, 1309
(1998
).14.
15.
S.
Denifl
, S.
Ptasińska
, M.
Cingel
, S.
Matejcik
, P.
Scheier
, and T. D.
Märk
, Chem. Phys. Lett.
377
, 74
(2003
).16.
R.
Abouaf
, J.
Pommier
, and H.
Dunet
, Int. J. Mass. Spectrom.
226
, 397
(2003
).17.
S.
Denifl
, S.
Matejcik
, B.
Gstir
, G.
Hanel
, M.
Probst
, P.
Scheier
, and T. D.
Märk
, J. Chem. Phys.
118
, 4107
(2003
).18.
H.
Abdoul-Carime
, M. A.
Huels
, E.
Illenberger
, and L.
Sanche
, Int. J. Mass. Spectrom.
228
, 703
(2003
).19.
S. Denifl, S. Ptasińska, S. Matejcik, E. Illenberger, P. Scheier, and T. D. Märk, Int. J. Mass Spectrometry (to be published).
20.
H.
Abdoul-Carime
, M. A.
Huels
, F.
Brüning
, E.
Illenberger
, and L.
Sanche
, J. Chem. Phys.
113
, 2517
(2000
).21.
K.
Aflatooni
, G. A.
Gallup
, and P. D.
Burrow
, J. Phys. Chem.
102
, 6205
(1998
).22.
23.
C.
Desfrancois
, H.
Abdoul-Carime
, and J. P.
Schermann
, J. Chem. Phys.
104
, 7792
(1996
).24.
J. H.
Hendricks
, S. A.
Lyapustina
, H. L.
de Clercq
, J. T.
Snodgrass
, and K. H.
Bowen
, J. Chem. Phys.
104
, 7788
(1996
).25.
C.
Desfrancois
, V.
Periquet
, Y.
Bouteilleir
, and J. P.
Schermann
, J. Phys. Chem.
102
, 1274
(1998
).26.
V.
Periquet
, A.
Moreau
, S.
Carles
, J. P.
Schermann
, and C.
Desfrancois
, J. Electron Spectrosc. Relat. Phenom.
106
, 141
(2000
).27.
J. H.
Hendricks
, S. A.
Lyapustina
, H. L.
de Clercq
, and K. H.
Bowen
, J. Chem. Phys.
108
, 8
(1998
).28.
J.
Schiedt
, R.
Weinkauf
, D. M.
Neumark
, and E. W.
Schlag
, Chem. Phys.
239
, 511
(1998
).29.
A. O.
Colson
and M. D.
Sevilla
, Int. J. Radiat. Biol.
67
, 627
(1995
).30.
S. D.
Wetmore
, R. J.
Boyd
, and L. A.
Eriksson
, Chem. Phys. Lett.
322
, 129
(2000
).31.
S. S.
Wesolowski
, M. L.
Leininger
, P. N.
Pentchev
, and H. F.
Schaefer
III, J. Am. Chem. Soc.
123
, 4023
(2001
).32.
N.
Russo
, M.
Toscano
, and A.
Grand
, J. Comput. Chem.
21
, 1243
(2000
).33.
D.
Muigg
, G.
Denifl
, A.
Stamatovic
, and T. D.
Märk
, Chem. Phys.
239
, 409
(1998
).34.
G.
Hanel
, T.
Fiegele
, A.
Stamatovic
, and T. D.
Märk
, Int. J. Mass. Spectrom.
205
, 65
(2001
).35.
S.
Matejcik
, G.
Senn
, P.
Scheier
, A.
Kiendler
, A.
Stamatovic
, and T. D.
Märk
, J. Chem. Phys.
107
, 8955
(1997
).36.
G.
Senn
, J. D.
Skalny
, A.
Stamatovic
, N. J.
Mason
, P.
Scheier
, and T. D.
Märk
, Phys. Rev. Lett.
82
, 5028
(1999
).37.
P.
Cicman
, M.
Francis
, J. D.
Skalny
, and T. D.
Märk
, Int. J. Mass. Spectrom.
223/224
, 271
(2003
), and references therein.38.
39.
D.
Klar
, M.-W.
Ruf
, H.
Hotop
, Int. J. Mass. Spectrom.
205
, 93
(2001
).40.
E. Illenberger, Gaseous Molecular Ions, Topics in Physical Chemistry, Vol. 2, edited by H. Baumgaertl, E. U. Frank, and W. Gruebein (Steinkopff Verlag, Darmstadt, Springer, New York, 1992).
41.
H.
Drexel
, W.
Sailer
, V.
Grill
, P.
Scheier
, E.
Illenberger
, and T. D.
Märk
, J. Chem. Phys.
118
, 7394
(2003
).42.
L. A.
Curtiss
, K.
Raghavachari
, and J. A.
Pople
, J. Chem. Phys.
98
, 1293
(1993
).43.
R. D.
Bach
, P. Y.
Ayala
, and H. B.
Schlegel
, J. Am. Chem. Soc.
118
, 12758
(1996
).44.
I.
Hahndorf
and E.
Illenberger
, Int. J. Mass. Spectrom.
167/168
, 87
(1997
).45.
S. Gohlke, H. Abdoul-Carime, and E. Illenberger, International Symposium on Electron–Molecule Collisions and Swarms, Pruhonice near Prague, 2003.
46.
S.
Gohlke
, A.
Rosa
, E.
Illenberger
, F.
Brünig
, and M. A.
Huels
, J. Chem. Phys.
116
, 10164
(2002
).47.
S.
Ptasińska
, S.
Denifl
, A.
Abedi
, P.
Scheier
, and T. D.
Märk
, Chem. Phys. Lett.
377
, 74
(2003
).48.
S. D.
Wetmore
, R. J.
Boyd
, and L. A.
Eriksson
, Chem. Phys. Lett.
343
, 151
(2001
).
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