Twisted Triplet Ethylene: Anharmonic Frequencies and Spectroscopic Parameters for C2H4, C2D4, and13C2H4

2014 ◽  
Vol 118 (35) ◽  
pp. 7560-7567 ◽  
Author(s):  
Xiao Wang ◽  
Walter E. Turner ◽  
Jay Agarwal ◽  
Henry F. Schaefer
Keyword(s):  
Spectroscopic Parameters ◽  
Anharmonic Frequencies

Transfer Learning to CCSD(T): Accurate Anharmonic Frequencies from Machine Learning Models

2021 ◽  
Author(s):  
Silvan Käser ◽  
Eric D. Boittier ◽  
Meenu Upadhyay ◽  
Markus Meuwly
Keyword(s):  
Machine Learning ◽  
Transfer Learning ◽  
Learning Models ◽  
Anharmonic Frequencies ◽  
Machine Learning Models

Vibronically coupled states: computational considerations and characterisation of vibronic and rovibronic spectroscopic parameters

2021 ◽  
Vol 40 (2) ◽  
pp. 165-298
Author(s):  
Ketan Sharma ◽  
Terry A. Miller ◽  
John F. Stanton
Keyword(s):  
Spectroscopic Parameters

Spectroscopic parameters of Nd3+ ion in phosphate glasses

1997 ◽  
Vol 221 (1) ◽  
pp. 47-58 ◽  
Author(s):  
G. Ajith Kumar ◽  
P.R. Biju ◽  
C. Venugopal ◽  
N.V. Unnikrishnan
Keyword(s):  
Phosphate Glasses ◽  
Spectroscopic Parameters

Spectroscopic parameters of the surface layer for the determination of the forces of van der Waals interaction of polymeric materials

1988 ◽  
Vol 24 (1) ◽  
pp. 13-17
Author(s):  
N. A. Myasnikova ◽  
A. V. Volkov ◽  
V. I. Kolesnikov
Keyword(s):  
Surface Layer ◽  
Van Der Waals ◽  
Polymeric Materials ◽  
Van Der Waals Interaction ◽  
Spectroscopic Parameters

scholarly journals 3D spectroscopic analysis of helium-line white dwarfs

2020 ◽  
Author(s):  
Elena Cukanovaite ◽  
Pier-Emmanuel Tremblay ◽  
Pierre Bergeron ◽  
Bernd Freytag ◽  
Hans-Günter Ludwig ◽  
...  
Keyword(s):  
Effective Temperature ◽  
White Dwarfs ◽  
Energy Transport ◽  
3D Models ◽  
Spectroscopic Technique ◽  
Surface Gravity ◽  
Atmospheric Models ◽  
Physical Treatment ◽  
Spectroscopic Parameters ◽  
1D Model

Abstract In this paper, we present corrections to the spectroscopic parameters of DB and DBA white dwarfs with −10.0 ≤ log (H/He) ≤−2.0, 7.5 ≤ log g ≤9.0 and 12 000 K ≲ Teff ≲ 34 000 K, based on 282 3D atmospheric models calculated with the CO5BOLD radiation-hydrodynamics code. These corrections arise due to a better physical treatment of convective energy transport in 3D models when compared to the previously available 1D model atmospheres. By applying the corrections to an existing SDSS sample of DB and DBA white dwarfs, we find significant corrections both for effective temperature and surface gravity. The 3D log g corrections are most significant for Teff ≲ 18, 000 K, reaching up to −0.20 dex at log g = 8.0. However, in this low effective temperature range, the surface gravity determined from the spectroscopic technique, can also be significantly affected by the treatment of the neutral van der Waals line broadening of helium and by non-ideal effects due to the perturbation of helium by neutral atoms. Thus, by removing uncertainties due to 1D convection, our work showcases the need for improved description of microphysics for DB and DBA model atmospheres. Overall, we find that our 3D spectroscopic parameters for the SDSS sample are generally in agreement with Gaia DR2 absolute fluxes within 1-3σ for individual white dwarfs. By comparing our results to DA white dwarfs, we determine that the precision and accuracy of DB/DBA atmospheric models are similar. For ease of user application of the correction functions, we provide an example Python code.

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