scholarly journals Collisional Excitation and Weak Maser Action of Interstellar Methanimine

2018 ◽  
Vol 9 (12) ◽  
pp. 3199-3204 ◽  
Author(s):  
Alexandre Faure ◽  
François Lique ◽  
Anthony J. Remijan
Keyword(s):  
Collisional Excitation ◽  
Maser Action

Transient collisional excitation X-ray laser generation with picoseconds laser pulses

2001 ◽  
Vol 11 (PR2) ◽  
pp. Pr2-39-Pr2-42 ◽  
Author(s):  
M. Kado ◽  
T. Kawachi ◽  
N. Hasegawa ◽  
M. Tanaka ◽  
K. Sukegawa ◽  
...  
Keyword(s):  
Laser Pulses ◽  
Laser Generation ◽  
Collisional Excitation ◽  
X Ray

Gain profile of transient collisional excitation X-ray laser

2001 ◽  
Vol 11 (PR2) ◽  
pp. Pr2-55-Pr2-57
Author(s):  
M. Tanaka ◽  
T. Kawachi ◽  
M. Kado ◽  
N. Hasegawa ◽  
K. Sukegawa ◽  
...  
Keyword(s):  
Collisional Excitation ◽  
X Ray ◽  
Gain Profile

scholarly journals Review of the soft-X-ray laser research at CEL-V

1991 ◽  
Vol 9 (2) ◽  
pp. 493-499
Author(s):  
D. Naccache ◽  
J-L. Bourgade ◽  
P. Combis ◽  
C. J. Keane ◽  
J-P. Le Breton ◽  
...  
Keyword(s):  
Atomic Number ◽  
Collisional Excitation ◽  
X Ray ◽  
Order Of Magnitude ◽  
Laser Experiments ◽  
Magnitude Increase

We present some significant results of collisional excitation X-ray laser experiments in plasmas produced by a laser. We studied the amplification in Ne- and Ni-like ions by varying both the nature and the thickness of targets, the irradiation, and the wavelength of the driving laser. Some potentially interesting scalings as a function of the atomic number of the lasing element are demonstrated in the Ne-like system. An order-of-magnitude increase in gain in the Ni-like experiments was determined.

scholarly journals Lyα Emitting Galaxies as a Probe of Reionisation

2014 ◽  
Vol 31 ◽  
Author(s):  
Mark Dijkstra
Keyword(s):  
Rapid Evolution ◽  
Line Emission ◽  
Coherent Scattering ◽  
Neutral Fraction ◽  
Collisional Excitation ◽  
Intergalactic Gas ◽  
Star Forming ◽  
Bolometric Luminosity ◽  
Radiative Processes ◽  
Sudden Reduction

AbstractThe Epoch of Reionization (EoR) represents a milestone in the evolution of our Universe. Star-forming galaxies that existed during the EoR likely emitted a significant fraction ( ~ 5 − 40%) of their bolometric luminosity as Lyα line emission. However, neutral intergalactic gas that existed during the EoR was opaque to Lyα emission that escaped from galaxies during this epoch, which makes it difficult to observe. The neutral intergalactic medium (IGM) may thus reveal itself by suppressing the Lyα flux from background galaxies. Interestingly, a ‘sudden’ reduction in the observed Lyα flux has now been observed in galaxies at z > 6. This review contains a detailed summary of Lyα radiative processes: I describe (i) the main Lyα emission processes, including collisional-excitation & recombination (and derive the origin of the famous factor ‘0.68’), and (ii) basic radiative transfer concepts, including e.g. partially coherent scattering, frequency diffusion, resonant versus wing scattering, optically thick versus ‘extremely’ optically thick (static/outflowing/collapsing) media, and multiphase media. Following this review, I derive expressions for the Gunn-Peterson optical depth of the IGM during (inhomogeneous) reionisation and post-reionisation. I then describe why current observations appear to require a very rapid evolution of volume-averaged neutral fraction of hydrogen in the context of realistic inhomogeneous reionisation models, and discuss uncertainties in this interpretation. Finally, I describe how existing & futures surveys and instruments can help reduce these uncertainties, and allow us to fully exploit Lyα emitting galaxies as a probe of the EoR.

Transient collisional excitation X-ray lasers with 1-ps tabletop drivers

1999 ◽  
Vol 5 (6) ◽  
pp. 1441-1446 ◽  
Author(s):  
J. Dunn ◽  
A.I. Osterheld ◽  
Yuelin Li ◽  
J. Nilsen ◽  
V.N. Shlyaptsev
Keyword(s):  
Collisional Excitation ◽  
X Ray

Collisional excitation of NH by H2: Potential energy surface and scattering calculations

2021 ◽  
Vol 155 (13) ◽  
pp. 134303
Author(s):  
Paul Pirlot ◽  
Yulia N. Kalugina ◽  
Ragav Ramachandran ◽  
Guillaume Raffy ◽  
Paul J. Dagdigian ◽  
...  
Keyword(s):  
Potential Energy ◽  
Potential Energy Surface ◽  
Energy Surface ◽  
Collisional Excitation

scholarly journals BASECOL2020 New Technical Design

Atoms ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 69 ◽  
Author(s):  
Yaye-Awa Ba ◽  
Marie-Lise Dubernet ◽  
Nicolas Moreau ◽  
Carlo Maria Zwölf
Keyword(s):  
Interstellar Medium ◽  
Data Center ◽  
Molecular Data ◽  
International Standards ◽  
Rate Coefficients ◽  
Collisional Excitation ◽  
Excitation Rate ◽  
Single Location ◽  
Molecular Databases ◽  
Key Features

The BASECOL database has been created and scientifically enriched since 2004. It contains collisional excitation rate coefficients of molecules for application to the interstellar medium and to cometary atmospheres. Recently, major technical updates have been performed in order to be compliant with international standards for management of data and in order to provide a more friendly environment to query and to present the data. The current paper aims at presenting the key features of the technical updates and to underline the compatibility of BASECOL database with the Virtual Atomic and Molecular Data Center. This latter aims to interconnect atomic and molecular databases, thus providing a single location where users can access atomic and molecular data.

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