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# Effects on nitrogen-acetone ice induced by energetic heavy ion collisions

K Alcantara, A. de Barros, E. da Silveira, H. Rothard, P. Boduch

► To cite this version:

K Alcantara, A. de Barros, E. da Silveira, H. Rothard, P. Boduch. Effects on nitrogen-acetone ice induced by energetic heavy ion collisions. Journal of Physics: Conference Series, 2015, 635 (2), pp.022067. 10.1088/1742-6596/635/2/022067. hal-02341330

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Submitted on 1 Jun 2022

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# Effects on nitrogen-acetone ice induced by energetic heavy ion collisions

To cite this article: K F Alcantara et al 2015 *J. Phys.: Conf. Ser.* **635** 022067

View the [article online](#) for updates and enhancements.

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# Effects on nitrogen-acetone ice induced by energetic heavy ion collisions

K. F. Alcantara*<fnref n="1" />, A. L. F. de Barros†, E. F. da Silveira*, H. Rothard, P. Boduch

**Synopsis** The radiolysis of a mixture of acetone and nitrogen condensed at 13 K by 40-MeV $^{58}$Ni$^{11+}$ ions was studied. The bombardment with heavy ions is highly efficient for inducing chemical reactions in ices. The dissociation rate of acetone mixed with nitrogen as a function of the fluence is determined from a sequence of infrared spectra. The formation of new molecular species due to the irradiation is investigated and their cross-sections are calculated

The N₂ molecule, formed by one of the most
abundant elements in the Universe, is the most
common constituent of Earth's modern atmos-
phere. It is also a major component of the at-
mosphere of Saturn's moon Titan and has been
detected in trace amounts in the atmospheres of
Venus and Mars. In acetone (CH₃COCH₃) the
C=O link, which also occurs in several mole-
cules of biological interest, is present. The mix-
ture of these two molecular species,
N₂:CH₃COCH₃, causes asymmetries in the ni-
trogen molecule, which enhances the IR absorp-
tion and allows its study by FTIR spectroscopy.
Moreover, the cosmic ray - ice interaction can
be simulated and analyzed by irradiating the
N₂:CH₃COCH₃ ice in laboratory [1].

Therefore, N₂: CH₃COCH₃ ice (1:1) was irra-
diated with 40 MeV ⁵⁸Ni¹¹⁺ ions, and FTIR
spectra were obtained at certain fluences. Figure
1 shows spectra of N₂: CH₃COCH₃ before (dot-
ted line) and after (solid line) irradiation.
Daughter molecules resulting from the induced
chemical reactions were identified; from the
dependence of the molecular abundance, the
evolution with fluence of destruction and com-
paction cross sections of the ice was deter-
mined. The average value of 2.2 ± 0.4 x 10⁻¹³
cm² was obtained for the average destruction
cross-section determined via seven IR bands. At
the beginning of irradiation, associated with ice
compaction, the presence of N₂ accelerates the
process of acetone destruction. However, for
high fluences, the structural rearrangement
caused by N₂ reduces the radiolysis rate com-
pared to pure acetone [2].

<figure><img src="image_5.png" /><figcaption>**Figure 1.** FTIR spectra of N₂: CH₃COCH₃ before (dotted line) and after (solid line). Some corresponding vibrational modes are indicated.</figcaption></figure>

References

[1] A. L. F de Barros *et al* 2014 *MNRAS* **438**, 2026–2035

[2] Diana P. P. Andrade *et al* 2014 *MNRAS* **444*, 3792–3801

<footnote>*Departamento de Física, PUC- Rio, Rua Marquês de São Vicente 225, 22451-900, RJ, Brazil.</footnote>

<footnote>†Departamento de Física, CEFET-RJ, Av.Maracanã, 229, 20271-110 Rio de Janeiro, RJ, Brazil</footnote>

<footnote>CIMAP-CIRIL-Ganil, Boulevard Henri Becquerel, BP 5133, F-14070 Caen Cedex 05, France</footnote>

<footnote n="1">¹E-mail: katianne.alcantara@gmail.com</footnote>