Interaction Potentials of Hg-Ar from Temperature Dependent Absorption Spectra

1978 ◽  
Vol 33 (12) ◽  
pp. 1461-1468 ◽  
Author(s):  
H. C. Petzold ◽  
W. Behmenburg
Keyword(s):  
Absorption Spectrum ◽  
Thermal Energy ◽  
Short Wavelength ◽  
Line Broadening ◽  
Vibrational States ◽  
Temperature Dependent ◽  
Satellite Structure ◽  
Lennard Jones ◽  
Dependent Absorption ◽  
Short Wavelength Side

Abstract The temperature dependence of the absorption spectrum k(v̄) of Hg-Ar-mixtures in the range 30-1000 cm-1 about the center of the Hg-line at v̄0 = 39425 cm-1 (λ0 = 2536.5 Å) has been investigated in the temperature interval 473 -1273 K. The measurements were carried out at number densities 1.0 x 1017-9.1 X 1018 cm-3 for Hg and 9.4 x 1018-9.7 x 1018 cm-3 for Ar. Potentials for the Hg-Ar-system in the thermal energy range originating from the Hg-states 61S0 and 63P1 have been deduced from the data. It turned out that they differ considerably from Lennard-Jones-functions. By comparison of the observed spectra with calculations on the basis of quantummechanical theory of collisional line broadening it is concluded that transitions from free translational states of Hg-Ar-pairs as well as bound and quasi-bound vibrational states of the Hg-Ar-molecule contribute to the formation of the satellite structure on the short wavelength side of the Hg-line.

Temperature-dependent absorption spectrum of betaine-30 in methanol

2002 ◽  
Vol 356 (3-4) ◽  
pp. 214-220 ◽  
Author(s):  
Xihua Zhao ◽  
Fritz J. Knorr ◽  
Jeanne L. McHale
Keyword(s):  
Absorption Spectrum ◽  
Temperature Dependent ◽  
Dependent Absorption

Temperature-induced structural phase transitions in RERhSn (RE = Y, Gd-Tm, Lu)

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Simon Engelbert ◽  
Rolf-Dieter Hoffmann ◽  
Jutta Kösters ◽  
Steffen Klenner ◽  
Rainer Pöttgen
Keyword(s):  
Rare Earth ◽  
Phase Transitions ◽  
Driving Force ◽  
Room Temperature ◽  
Structural Phase ◽  
Structural Phase Transitions ◽  
Line Broadening ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
X Ray

Abstract The structures of the equiatomic stannides RERhSn with the smaller rare earth elements Y, Gd-Tm and Lu were reinvestigated on the basis of temperature-dependent single crystal X-ray diffraction data. GdRhSn crystallizes with the aristotype ZrNiAl at 293 and 90 K. For RE = Y, Tb, Ho and Er the HP-CeRuSn type (approximant with space group R3m) is already formed at room temperature, while DyRhSn adopts the HP-CeRuSn type below 280 K. TmRhSn and LuRhSn show incommensurate modulated variants with superspace groups P31m(1/3; 1/3; γ) 000 (No. 157.1.23.1) (γ = 3/8 for TmRhSn and γ = 2/5 for LuRhSn). The driving force for superstructure formation (modulation) is a strengthening of Rh–Sn bonding. The modulation is expressed in a 119Sn Mössbauer spectrum of DyRhSn at 78 K through line broadening.

Nuclear Quadrupole Hyperfine Structure of the Direct /-Type Transitions of the Fulminic Acid Isotopomers H12C14N16O and H13C14N16O

1996 ◽  
Vol 51 (3) ◽  
pp. 207-214
Author(s):  
Jürgen Preusser ◽  
Manfred Winnewisser
Keyword(s):  
Hyperfine Structure ◽  
Vibrational State ◽  
Line Broadening ◽  
Frequency Range ◽  
Vibrational States ◽  
Contour Fitting ◽  
Splitting Parameter ◽  
Nuclear Quadrupole ◽  
Significant Line ◽  
Large Amplitude Motion

The direct I- type transitions of H133C14N16O in the vibrational states (υ4,υ5) = (01) and (03) were measured in the frequency range from 18 to 40 GHz. These transitions show a nuclear quadrupole hyperfine structure caused by the 14N nucleus, which could partially be resolved at Doppler-limited resolution. The analogous transitions of the parent species. H12C14N16O, were remeasured. They displayed a very similar hyperfine structure, also partially resolved. The hyperfine patterns of both H12C14N16O and H13C14N16O were analysed by means of contour fitting s to the absorption profiles. The parameter ηseQq, which is responsible for the splittings, is determined to be 645(20) kHz for the vibrational state (01) and 890(44) kHz for the vibrational state (03) for H12C14N16O and 642(32) kHz for (01) and 898(22) kHz for (03) for H13C14N16O. This unexpectedly large splitting parameter for states involving the large amplitude motion υ5 (HCN bending) is discussed as another consequence of the quasilinearity of fulminic acid, in view of the fact that the analogous transitions for the vibrational state (10) (NCO bending) do not split or even show a significant line broadening at the resolution used for the present measurements

An analysis of temperature-dependent absorption and photocurrent spectra in BaAl2Se4 layers

2015 ◽  
Vol 117 (16) ◽  
pp. 165704
Author(s):  
K. J. Hong ◽  
T. S. Jeong ◽  
C. J. Youn ◽  
J. D. Moon
Keyword(s):  
Temperature Dependent ◽  
Dependent Absorption ◽  
Photocurrent Spectra
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