journal article·2026-04-01Open access

Low-energy proton impact dynamics on hydrocarbons: Dependence on kinetic energy and incident site

Misa Viveiros, Roy Lau, Samuel S. Taylor, Patrick Barron, Attila Czirják, Cody Covington, Kálmán Varga

AIP Advances· Volume 16· Issue 4

Abstract

The dynamics of low-energy proton collisions with hydrocarbon molecules are investigated using real-time time-dependent density functional theory. Through systematic variation of proton kinetic energy and impact site on the molecular surface, the resulting scattering, proton capture, and bond dissociation pathways are analyzed. The simulations reveal a strong dependence of reaction outcomes on both incident energy and collision geometry, with the interplay between electronic and nuclear degrees of freedom highlighted as governing molecular fragmentation and reaction mechanisms. These findings provide insight into the fundamental processes underlying proton–hydrocarbon interactions relevant to radiation chemistry, ion-beam processing, astrochemical environments, and Coulomb explosion.
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Research context

OpenAlex topics: Astro and Planetary Science · Gamma-ray bursts and supernovae · Nuclear physics research studies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics and Astronomy, Vanderbilt University 1 , Nashville, Tennessee 37235,

Pritzker School of Molecular Engineering, University of Chicago 2 , Chicago, Illinois 60637,

ELI ALPS, ELI-HU Non-Profit Ltd 3 , Wolfgang Sandner utca 3., 6728 Szeged,

Department of Theoretical Physics, University of Szeged 4 , Tisza L. krt. 84-86, 6720 Szeged,

Department of Chemistry, Austin Peay State University 5 , Clarksville, Tennessee 37044,

Funding

Division of Materials Research · National Science Foundation Graduate Research Fellowship Program · National Science Foundation · European Regional Development Fund

References (77)

Show source-provided references
1. Radiation damage in biomolecules and cells 3.010.3390/ijms25126368 ↗
2. Electronic excitation response of DNA to high-energy proton radiation in water10.1103/physrevlett.130.118401 ↗
3. Towards the ionizing radiation induced bond dissociation mechanism in oxygen, water, guanine and DNA fragmentation: A density functional theory simulation10.1038/s41598-022-23727-3 ↗
4. Mapping electron beam-induced radiolytic damage in molecular crystals10.1093/mam/ozae044.902 ↗
5. Tumortherapy with ion beams10.1016/s0168-9002(00)00802-0 ↗
6. Proton radiobiology10.3390/cancers7010353 ↗
7. Proton beam therapy for craniopharyngioma: A systematic review and meta-analysis10.1186/s13014-024-02556-w ↗
8. Emerging technologies for cancer therapy using accelerated particles10.1016/j.ppnp.2023.104046 ↗
9. Recent progress in the application of ion beam technology in the modification and fabrication of nanostructured energy materials10.1021/acsnano.3c07896 ↗
10. Dominant impact of ion velocity on defect formation in suspended graphene10.1016/j.surfin.2025.105872 ↗
11. Surface self-assembly of gold nanoparticles on graphite driven by ion-irradiation-induced atomic defects10.1016/j.apsusc.2025.163442 ↗
12. Engineering of nanostructured carbon materials with electron or ion beams10.1038/nmat1996 ↗
13. Simulation of high-energy ion collisions with graphene fragments10.1103/physrevb.85.235435 ↗
14. Efficient real-time time-dependent density functional theory method and its application to a collision of an ion with a 2D material10.1103/physrevlett.114.063004 ↗
15. The role of ion-molecule reactions in the growth of heavy ions in titan’s ionosphere10.1002/2014JA020208 ↗
16. Destruction of interstellar methyl cyanide (CH3CN) via collisions with He+ ions10.1051/0004-6361/202451674 ↗
17. Exploring the role of ion–molecule reactions on interstellar icy grain surfaces10.1021/acsearthspacechem.4c00194 ↗
18. Proton-impact-induced electron emission from biologically relevant molecules studied with a screened independent atom model10.1088/1361-6455/ab3a63 ↗
19. Water-molecule dissociation by proton and hydrogen impact10.1103/physreva.75.042711 ↗
20. Complete breakup of the helium atom by proton and antiproton impact10.1103/physrevlett.103.213201 ↗
21. Proton scattering from excited states of atomic hydrogen10.1088/1361-6587/aad436 ↗
22. Proton impact on ground and excited states of atomic hydrogen10.1140/epjd/e2019-100380-x ↗
23. TDDFT-based study on the proton–DNA collision10.1021/acs.jpcb.7b04934 ↗
24. Time-dependent density-functional-theory investigation of the collisions of protons and α particles with uracil and adenine10.1103/physreva.95.052701 ↗
25. Collision site effect on the radiation dynamics of cytosine induced by proton10.1088/1674-1056/ac4900 ↗
26. Collision processes of C2,3Hy and C2,3Hy+ hydrocarbons with electrons and protons10.1063/1.1630794 ↗
27. Formation of H2+ by ultra–low–energy collisions of protons with condensed molecular solids10.1021/jp203310k ↗
28. Probing molecular solids with low–energy ions10.1146/annurev-anchem-062012-092547 ↗
29. Synergistic chemical erosion of graphite due to simultaneous bombardment by H+ and low–Z ions10.1016/0168-583X(93)95915-R ↗
30. Chemical sputtering and surface damage of graphite by low–energy hydrogen ions10.1016/j.vacuum.2007.12.010 ↗
31. Electron capture from hydrocarbon molecules by proton projectiles in the 60–120 keV energy range10.1063/1.59216 ↗
32. Electron capture by protons and electron loss from hydrogen atoms in collisions with hydrocarbon and hydrogen molecules in the 60–120 keV energy range10.1088/0953-4075/36/18/311 ↗
33. Proton and helium stopping cross sections in gaseous hydrocarbon compounds10.1016/0168-583x(84)90561-5 ↗
34. Net electron capture in collisions of multiply charged projectiles with biologically relevant molecules10.3390/atoms8030059 ↗
35. Electron capture and ionization cross-section calculations for proton collisions with methane and the DNA and RNA nucleobases10.1140/epjd/e2019-100344-2 ↗
36. High energy proton ejection from hydrocarbon molecules driven by highly efficient field ionization10.1103/physrevlett.106.163001 ↗
37. Proton migration in hydrocarbons induced by slow highly charged ion impact10.1063/1.5088690 ↗
38. Self-interaction effects on charge-transfer collisions10.1103/physreva.95.042517 ↗
39. Proton collision on deoxyribose originating from doubly ionized water molecule dissociation10.1021/acs.jpca.8b04787 ↗
40. Molecular-scale modeling of light emission by combustion: An ab initio study10.1038/s41598-019-49200-2 ↗
41. Theoretical study on collision dynamics of H+ + CH4 at low energies10.1063/1.4863635 ↗
42. CH(A) radical formation in Coulomb explosion from butane seeded plasma generated with chirp-controlled ultrashort laser pulses10.1021/acsomega.4c11074 ↗
43. Enhanced ionisation of polyatomic molecules in intense laser pulses is due to energy upshift and field coupling of multiple orbitals10.1088/1361-6455/aa7098 ↗
44. Role of proton dynamics in efficient photoionization of hydrocarbon molecules10.1103/physreva.89.023429 ↗
45. Fragmentation in Coulomb explosion of hydrocarbon molecules10.1103/physreva.111.013109 ↗
46. Nuclear fusion driven by Coulomb explosion of methane clusters10.1021/jp0206121 ↗
47. Role of the molecular electronic configuration in the Coulomb fragmentation of N2, C2H2 and C2H4 in an intense laser field10.1088/0953-4075/25/17/003 ↗
48. Coulomb explosion of large polyatomic molecules assisted by nonadiabatic charge localization10.1103/physrevlett.92.063001 ↗
49. Dissociative ionization and Coulomb explosion of CH4 in two-color asymmetric intense laser fields10.1039/d3cp02337k ↗
50. Quantum effects of Coulomb explosion simulations revealed by time-dependent density-functional theory10.1103/physreva.111.033109 ↗
51. Ionization of ethane, butane, and octane in strong laser fields10.1103/physreva.82.043433 ↗
52. Time-dependent density-functional studies of the D2 Coulomb explosion10.1021/jp0600460 ↗
53. Density-functional theory for time-dependent systems10.1103/physrevlett.52.997 ↗
54. 2012
55. Reproducibility of real-time time-dependent density functional theory calculations of electronic stopping power in warm dense matter10.1063/5.0198008 ↗
56. All-electron real-time and imaginary-time time-dependent density functional theory within a numeric atom-centered basis function framework10.1063/5.0066753 ↗
57. Recent advances in real-time time-dependent density functional theory simulations of plasmonic nanostructures and plasmonic photocatalysis10.1021/acsnanoscienceau.2c00061 ↗
58. Real-time time-dependent density functional theory for simulating nonequilibrium electron dynamics10.1021/jacs.3c08226 ↗
59. Efficient real-time time-dependent density functional theory method and its application to a collision of an ion with a 2D material10.1103/PhysRevLett.114.063004 ↗
60. Kohn–Sham decomposition in real-time time-dependent density-functional theory: An efficient tool for analyzing plasmonic excitations10.1021/acs.jctc.7b00589 ↗
61. SALMON: Scalable Ab-initio light–matter simulator for optics and nanoscience10.1016/j.cpc.2018.09.018 ↗
62. Time-dependent density-functional theory in massively parallel computer architectures: The octopus project10.1088/0953-8984/24/23/233202 ↗
63. Time-dependent density functional theory beyond Kohn–Sham slater determinants10.1039/c6cp00722h ↗
64. Reformulation of time-dependent density functional theory for nonperturbative dynamics: The Rabi oscillation problem resolved10.1103/PhysRevLett.133.096401 ↗
65. Real-time time-dependent electronic structure theory10.1021/acs.chemrev.0c00223 ↗
66. Scattering of a proton with the Li4 cluster: Non-adiabatic molecular dynamics description based on time-dependent density-functional theory10.1016/j.chemphys.2011.07.005 ↗
67. 2011
68. Efficient pseudopotentials for plane-wave calculations10.1103/physrevb.43.1993 ↗
69. Self-interaction correction to density-functional approximations for many-electron systems10.1103/physrevb.23.5048 ↗
70. Comparison of self-interaction-corrections for metal clusters10.1088/0953-4075/35/4/333 ↗
71. Time-dependent density-functional theory for determining the electron-capture cross section for protons impacting on atoms and molecules10.1021/acs.jpca.2c08213 ↗
72. Density-functional theory for fractional particle number: Derivative discontinuities of the energy10.1103/physrevlett.49.1691 ↗
73. Derivation and reflection properties of a transmission-free absorbing potential10.1063/1.1517042 ↗
74. Imaging an aligned polyatomic molecule with laser-induced electron diffraction10.1038/ncomms8262 ↗
75. Recent advances and perspectives on nonadiabatic mixed quantum–classical dynamics10.1021/acs.chemrev.7b00577 ↗
76. Minimizing the time-dependent density functional error in Ehrenfest dynamics10.1021/acs.jpclett.1c02020 ↗
77. Access: Advancing innovation: NSF’s advanced cyberinfrastructure coordination ecosystem: Services & support