Dissociative Excitation of Nitromethane Induced by Electron Impact in the Ultraviolet – Visible Spectrum

Abstract

The excitation of nitromethane (CH3NO2), which is an important propellant and prototypic molecule for large class of explosives, has been investigated by electron impact and subsequent emission of photons in the UV-VIS spectral region between 300 nm and 670 nm. Emission spectrum of nitromethane was recorded at an electron energy of 50 eV. New dissociative excitation channels were discovered through the appearance of different CH, CN, NH, OH and NO bands, and the Balmer series of atomic hydrogen. In addition, relative emission cross sections were recorded for the transitions of selected fragments. The emission spectrum was captured at significantly higher resolution in comparison to previous studies.

Radiation Spectral Analysis of 3D Dust Molecular Clusters (PAHs) and Peptoids under Ionization and Electric Field in ISM

“…We assume that the reflectivity of smooth dust is approximately equal to the emissivity of dust, because the vibrational frequency of electrons around dust atoms does not match the frequency of light waves. When an atom or molecule in an excited state transition back to the ground or lower excited state, the energy is emitted in the form of new light waves radiation, forming an emission phenomenon (Nagasaka et al 2005;Yin et al 2006;Orszagh et al 2022;Takahashi et al 2022). The reflectivity of dust is close to 1.…”

Interaction of low-energy electrons with radiosensitizers

“…101,265,266 Another possible approach can be quantitative electroninduced fluorescence. 267 A properly designed fluorescent probe requiring singlet to triplet excitation by LEEs to induce fluorescence can be irradiated by LEEs in realistic environments e.g. in liquid jets.…”

“…The need for the studies of LEE processes in biologically relevant molecules was already well defined by Ptasinska et al 285 The detection of neutrals is important for the process of neutral dissociation upon electron impact as well as for dissociative electron attachment.1 In the first case, various techniques were developed historically from electron energy loss-based approaches used mainly for diatomics to electron-induced fluorescence measurements performing well at higher energies, where electronically excited fragments are forming. [286][287][288] Interesting can be a combination of the fluorescence technique with coincidence measurement of the outgoing electron, since the outgoing electron will provide information about the initial dissociative state while photons the final state of the dissociated fragment.…”