Electron-Impact-Induced Excitation of Glutamine Molecules

Érdevdi, N. M.; Bulhakova, A. I.; Шпеник, О. Б.; Zavilopulo, A. N.

doi:10.1134/s1063785020080209

Cited by 8 publications

(7 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The electron-induced fragmentation processes of larger biomolecules also showed similar nature. Electron collisions with adenine [ 47 , 50 ], cytosine [ 48 ], thymine [ 49 ], and glutamine [ 51 , 52 ] molecules prompted their decomposition through various channels, the most apparent of which contained the detachment of hydrogen atoms and diatomic radicals in the excited states with the subsequent fluorescence emission. In contrast to the studies discussed thus far, but in line with the observations made here, the light projectiles (H + , H 2 + , H 3 + , He 2+ ) dissociated furan and tetrahydrofuran molecules ineffectively, leading mainly to their dissociation into excited H( n ) atoms [ 24 , 25 , 26 , 28 , 31 ].…”

Section: Resultsmentioning

confidence: 99%

“…Conversely, excited products can be identified by detecting their emission [ 42 , 43 ]. Therefore, fluorescence spectroscopies have been utilized extensively to search excited neutral fragments in electron and photon-induced excitation, ionization, and fragmentation of biomolecular targets [ 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Neutral Dissociation of Pyridine Evoked by Irradiation of Ionized Atomic and Molecular Hydrogen Beams

Wąsowicz

2021

IJMS

View full text Add to dashboard Cite

The interactions of ions with molecules and the determination of their dissociation patterns are challenging endeavors of fundamental importance for theoretical and experimental science. In particular, the investigations on bond-breaking and new bond-forming processes triggered by the ionic impact may shed light on the stellar wind interaction with interstellar media, ionic beam irradiations of the living cells, ion-track nanotechnology, radiation hardness analysis of materials, and focused ion beam etching, deposition, and lithography. Due to its vital role in the natural environment, the pyridine molecule has become the subject of both basic and applied research in recent years. Therefore, dissociation of the gas phase pyridine (C5H5N) into neutral excited atomic and molecular fragments following protons (H+) and dihydrogen cations (H2+) impact has been investigated experimentally in the 5–1000 eV energy range. The collision-induced emission spectroscopy has been exploited to detect luminescence in the wavelength range from 190 to 520 nm at the different kinetic energies of both cations. High-resolution optical fragmentation spectra reveal emission bands due to the CH(A2Δ → X2Πr; B2Σ+ → X2Πr; C2Σ+ → X2Πr) and CN(B2Σ+ → X2Σ+) transitions as well as atomic H and C lines. Their spectral line shapes and qualitative band intensities are examined in detail. The analysis shows that the H2+ irradiation enhances pyridine ring fragmentation and creates various fragments more pronounced than H+ cations. The plausible collisional processes and fragmentation pathways leading to the identified products are discussed and compared with the latest results obtained in cation-induced fragmentation of pyridine.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Neutral Dissociation of Pyridine Evoked by Irradiation of Ionized Atomic and Molecular Hydrogen Beams

Wąsowicz

2021

IJMS

View full text Add to dashboard Cite

show abstract

“…Luminescence radiation through a filter (4) was directed to the entrance slit of the monochromator (5) and recorded by a detector (6). The signal from the detector was processed and sent to the A/D conversion (7 ), and a USB-port of a computer (8). The experiment was controlled automatically by a personal computer.…”

Section: Setup For Excitation By Photonsmentioning

confidence: 99%

“…Studies of various processes of interaction of lowenergy (slow) electrons with molecules that are part of DNA and RNA are of particular interest. These processes are a subject of intensive research [6][7][8][9][10]. It should be noted that secondary electron emission, which is the result of the primary interaction of electrons with a molecule, plays an important role in the mechanism of radiation damage to DNA.…”

Section: Introductionmentioning

confidence: 99%

Excitation of L-valine molecules by electrons and photons

et al. 2022

Self Cite

View full text Add to dashboard Cite

Graphical abstract Excitation of L-valine molecules was studied by optical spectroscopy. Optical emission spectra of the L-valine molecule and optical excitation functions of molecular bands and the H β spectral line were measured in the gas phase using electron impact. In the spectra of optical emission in the wavelength range of 250–500 nm, intense emission bands were found at energies of incident electrons of 30, 50 and 70 eV. Analysis of structural features of the valine molecule suggested a fragmentation scheme with the formation of excited particles in collisions with electrons. A notable feature of the presented optical excitation functions is a different growth dynamics with an increase in the energy of exciting electrons and the presence of a number of features and kinks, which are especially pronounced for λ = 305 nm and λ = 311 nm. The excitation thresholds were determined from the initial sections of the excitation functions of the most intense spectral lines by the least-squares method. The photoluminescence spectra of L-valine were measured for the first time on a Shimadzu RF-6000 spectrofluorophotometer in the spectral range of 400–800 nm for excitation wavelengths of 250, 275, 333, 351, and 380 nm.

show abstract

“…Penetrating the body, radiation generates fluxes of lowenergy secondary electrons with energies from 0.1 to tens of electron volts [1]. Secondary electrons initiate destructive changes in DNA and RNA due to excitation [2,3] and ionization [4], the consequences of which can be estimated by studying information about the most probable channels for fragmentation of these biomolecules.…”

Section: Introductionmentioning

confidence: 99%

Ionization and fragmentation of valine molecules in the gas phase by electron impact

et al. 2021

Self Cite

View full text Add to dashboard Cite

Formation of fragment ions due to single and dissociative ionization of the valine molecule (C5H11NO2) by electrons was studied by mass spectrometry. This is the first experimental massspectrometric measurement of total cross-section in arbitrary units of the valine molecule ionization by electron impact. The experiment was carried out using a setup with an MX-7304A monopole mass spectrometer in the range of mass numbers of 0-120 Da. Mass spectra of the molecules were studied at different vapor temperatures. The results obtained were compared with the mass spectra of the D-, L-, and DL-enantiomeric forms of the valine molecule taken from NIST and SDBS databases. The features of the processes of fragment ion formation of valine molecules by electron impact were analyzed in detail. Dynamics of the fragment ion yield in the range of the initial substance evaporation temperatures of 300-440 K was studied. The ionization potential of the valine molecule was measured (8.72 ± 0.22 eV) and calculated ab initio in the adiabatic approximation (9.367 eV). The ionization potential was estimated from the binding energy of the HOMO orbital of the neutral molecule. This is the first calculation of the single ionization cross section of the D-, DL-, and L-forms of this molecule in the Binary-Encounter-Bethe model and using the Gryzinski formula. The experimental cross section values at the threshold are normalized by the theoretical values in absolute units.

show abstract

Electron-Impact-Induced Excitation of Glutamine Molecules

Cited by 8 publications

References 9 publications

Neutral Dissociation of Pyridine Evoked by Irradiation of Ionized Atomic and Molecular Hydrogen Beams

Neutral Dissociation of Pyridine Evoked by Irradiation of Ionized Atomic and Molecular Hydrogen Beams

Excitation of L-valine molecules by electrons and photons

Ionization and fragmentation of valine molecules in the gas phase by electron impact

Contact Info

Product

Resources

About