Results 31 to 40 of about 883,477 (298)

Calculated oscillator strengths and transition probabilities of singly ionised nickel (Ni II)

open access: yesAstronomy & Astrophysics
Aims. This work reports calculated transition probabilities for spectral lines of singly ionised nickel (Ni II) incorporating newly determined experimental energy levels, addressing critical gaps in atomic data required for astrophysical spectroscopy and
Clear Christian P.   +2 more
doaj   +1 more source

Electron energy-loss spectroscopy of autoionizing states of zinc [PDF]

open access: yesSerbian Astronomical Journal, 2004
Autoionizing energy-loss spectra of Zn from 10.8 to 12.5 eV, for incident electron energies between 20 and 100 eV, have been recorded at scattering angles from 0° to 10°.
Predojević B.   +4 more
doaj   +1 more source

The Upgraded Planck System of Units That Reaches from the Known Planck Scale All the Way Down to Subatomic Scales

open access: yesAstronomy, 2023
Natural systems of units {Ui} need to be overhauled to include the dimensionless coupling constants {αUi} of the natural forces. Otherwise, they cannot quantify all the forces of nature in a unified manner. Thus, each force must furnish a system of units
Dimitris M. Christodoulou   +1 more
doaj   +1 more source

Prediction of forbidden ultraviolet and visible emissions in comet 67P/Churyumov-Gerasimenko

open access: yes, 2015
Remote observation of spectroscopic emissions is a potential tool for the identification and quantification of various species in comets. CO Cameron band (to trace \cod) and atomic oxygen emissions (to trace H$_2$O and/or CO$_2$, CO) have been used to ...
Bhardwaj, Anil   +2 more
core   +1 more source

Stark Broadening of N VI Spectral Lines

open access: yesUniverse, 2023
Stark broadening parameters, line widths and shifts, for 15 N VI multiplets are calculated using semiclassical perturbation theory for temperatures from 50,000 K to 2,000,000 K, and perturber density of 1016 cm−3. As perturbers have been taken electrons,
Milan S. Dimitrijević   +2 more
doaj   +1 more source

Matter wave interference using two-level atoms and resonant optical fields [PDF]

open access: yes, 1998
A theory of matter wave interference is developed in which resonant optical fields interact with two-level atoms. When recoil effects are included, spatial modulation of the atomic density can occur for times that are greater than or comparable with the ...
Berman, P. R., Dubetsky, B.
core   +2 more sources

Semiclassical Stark Broadening Parameters of Ar VII Spectral Lines

open access: yesAtoms, 2017
Using the semi-classical perturbation approach in the impact approximation, full width at half maximum and shift have been determined for eight spectral lines of Ar VII, for broadening by electron-, proton-, and He III-impacts.
Milan S. Dimitrijević   +2 more
doaj   +1 more source

Carcinomas and Carcinoid Tumors of the Lungs and Bronchi in Children and Adolescents: The EXPeRT Recommendations

open access: yesPediatric Blood &Cancer, EarlyView.
ABSTRACT Primary lung carcinomas and bronchial carcinoid tumors (BC) are very rare malignancies in childhood. While typical BC and mucoepidermoid carcinomas are mostly low‐grade, localized tumors with a more favorable prognosis than in adults, necessitating avoidance of overtreatment, adenocarcinomas of the lung are often diagnosed at advanced disease ...
Michael Abele   +19 more
wiley   +1 more source

Benchmarking Current Capabilities for the Generation of Excitation and Photoionisation Atomic Data

open access: yesGalaxies, 2018
The spectra currently emerging from modern ground- and space-based astronomical instruments are of exceptionally high quality and resolution. To meaningfully analyse these spectra, researchers utilise complex modelling codes to replicate the observations.
Catherine Ramsbottom   +6 more
doaj   +1 more source

Atomic Collision Processes [PDF]

open access: yesNature, 1952
Electronic and Ionic Impact Phenomena By Prof. H. S. W. Massey and E. H. S. Burhop. (International Series of Monographs on Physics.) Pp. xviii + 670. (Oxford: Clarendon Press; London: Oxford University Press, 1952.) 70s. net.
openaire   +1 more source

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