Normal Auger spectra of Br in alkali bromide molecules

Hu, Zhengfa; Calò, Antonio; Nikkinen, Juha; Matila, T.; Kukk, E.; Aksela, H.; Aksela, S.

doi:10.1063/1.1797732

Cited by 7 publications

(3 citation statements)

References 36 publications

(24 reference statements)

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“…The overall enhancement in the electron emission cross section from bromouracil compared to uracil (figures 4 and 5) may be explained by the Auger cascade effect as well as the atomic giant resonance phenomena. The vacancy created in the 3d shell of a Br atom gives rise to an Auger cascade and several electrons in the energy range between 40 and 50 eV [47] can be generated from the MNN Auger process. A part of these electrons may also be produced due to collective excitation which occurs when the 3d electrons are resonantly excited to higher excited states and finally decays by emission of several electrons.…”

Section: Ddcs Ratiosmentioning

confidence: 99%

Electron emission from bromouracil and uracil induced by protons and radiosensitization

et al. 2022

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Absolute double differential cross sections (DDCS) of electrons emitted from uracil and 5-bromouracil (BrU) in collisions with protons of energy 200 keV have been measured for various forward and backward emission angles over wide range of electron energies. The measured DDCS are compared with the continuum distorted wave-eikonal initial state (CDW-EIS) calculations. The optimized structure of the BrU was estimated along with the population analysis of all the occupied orbitals using a self-consistent field density. A comparison between the measured DDCS data for the two molecules show that the cross section of low energy electrons emitted from BrU is substantially larger than that for uracil. The BrU-to-uracil DDCS ratios obtained from the present measurements indicate an enhancement of the electron emission by a factor which is as large as 2.0 to 2.5. These electrons being the major agent for damaging the DNA/RNA of the malignant tissues, the present results are expected to provide an important input for the radiosensitization effect in hadron therapy. It is noteworthy to mention that the CDW-EIS calculations for Coulomb ionization cannot predict such enhancement. A large angular asymmetry is observed for uracil with a broad structure, which is absent in case of BrU.

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Section: Ddcs Ratiosmentioning

confidence: 99%

Electron emission from bromouracil and uracil induced by protons and radiosensitization

et al. 2022

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“…The experiments were performed at MAX-lab (Sweden) at the I411 beamline (proposal number 20130121 [44] between 84-88 eV which have been taken into account during the fitting procedure but are not displayed explicitly. Pure monomer spectrum (not shown) was used as a reference for obtaining the Lorentzian full width at half maxima (FWHMs), the spin-orbit splitting, and the relative intensities of the monomer peaks.…”

Section: Acknowledgmentsmentioning

confidence: 99%

Experimental observation of structural phase transition in CsBr clusters

et al. 2017

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Formation and growth of CsBr clusters embedded in unsupported Ar clusters was studied using synchrotron radiation photoelectron spectroscopy. The development of the core-level electronic structure for cluster sizes between a few and a few hundred atoms contained information about the local coordination of the constituent particles. The experimental results indicate that a gradual structural phase transition from NaCl structure to CsCl structure for CsBr clusters takes place at around 160 atoms per cluster.

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“…The two strongest lines at 66 eV and 13.3 eV can be assigned to the ionization of He leading to He + (1s 1 ) (IP = 24.58 eV) and ionization of the 3d shell of Br 2 (IP = 77.4 eV), respectively. The two broad lines at 45 and 30 eV are attributed to the ionization of the 3d shell of Br 2 followed by the M 4,5 N 2,3 N 2,3 and M 4,5 N 1 N 1 Auger decay [71]. Ionization to the first (He + , n = 2; IP = 65.4 eV) and second (He + , n = 3; IP = 73 eV) excited ionic shell of He leads to the two lines observed at 25.5 and 17.7 eV kinetic energy [72] whereas the strong contribution around 36 eV kinetic energy can be assigned to a sequential two-photon ionization of He due to the strong peak intensity of the FEL pulse.…”

Section: Fel-induced Coulomb Explosion Imaging Inmentioning

confidence: 96%

Towards imaging of ultrafast molecular dynamics using FELs

Rouzée

Johnsson

Rading

et al. 2013

J. Phys. B: At. Mol. Opt. Phys.

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The dissociation dynamics induced by a 100 fs, 400 nm laser pulse in a rotationally cold Br2 sample was characterized by Coulomb explosion imaging (CEI) using a time-delayed extreme ultra-violet (XUV) FEL pulse, obtained from the Free electron LASer in Hamburg (FLASH). The momentum distribution of atomic fragments resulting from the 400 nm-induced dissociation was measured with a velocity map imaging spectrometer and used to monitor the internuclear distance as the molecule dissociated. By employing the simultaneously recorded in-house timing electro-optical sampling data, the time resolution of the final results could be improved to 300 fs, compared to the inherent 500 fs time-jitter of the FEL pulse. Before dissociation, the Br2 molecules were transiently ‘fixed in space’ using laser-induced alignment. In addition, similar alignment techniques were used on CO2 molecules to allow the measurement of the photoelectron angular distribution (PAD) directly in the molecular frame (MF). Our results on MFPADs in aligned CO2 molecules, together with our investigation of the dissociation dynamics of the Br2 molecules with CEI, show that information about the evolving molecular structure and electronic geometry can be retrieved from such experiments, therefore paving the way towards the study of complex non-adiabatic dynamics in molecules through XUV time-resolved photoion and photoelectron spectroscopy.

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Normal Auger spectra of Br in alkali bromide molecules

Cited by 7 publications

References 36 publications

Electron emission from bromouracil and uracil induced by protons and radiosensitization

Electron emission from bromouracil and uracil induced by protons and radiosensitization

Experimental observation of structural phase transition in CsBr clusters

Towards imaging of ultrafast molecular dynamics using FELs

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