Theory of a phonon–exciton resonance in a molecular crystal

1970 ◽  
Vol 48 (13) ◽  
pp. 1539-1547 ◽  
Author(s):  
H. R. Zaidi
Keyword(s):  
Molecular Crystal ◽  
Strong Influence ◽  
Shape Function ◽  
Phonon Density ◽  
Exciton Resonance ◽  
Phonon Branch ◽  
Exciton Mode ◽  
The One ◽  
Solid Hd ◽  
Line Shape Function

The theory of a coupled phonon–roton (rotational exciton) mode in a molecular crystal is developed using the propagator technique. The dispersion relation and the phonon density of states are calculated. The results are applied to the case of solid HD. The line-shape function for the one phonon branch, phonon–roton coupling, and the roton band frequencies are calculated for this case. Near the phonon–roton resonance, the one phonon branch shows strong influence of the interaction with the roton band.

ON THE TEMPERATURE DEPENDENCE OF PARAMAGNETIC RESONANCE IN THE CASE OF THE ISING MODEL

1961 ◽  
Vol 39 (12) ◽  
pp. 1733-1737 ◽  
Author(s):  
Y. Y. Lee
Keyword(s):  
Ising Model ◽  
Temperature Dependence ◽  
Approximation Method ◽  
Line Shape ◽  
Theoretical Study ◽  
Shape Function ◽  
Paramagnetic Resonance ◽  
One Dimensional ◽  
The One ◽  
Line Shape Function

The adequacy of the approximation method used by McMillan and Opechowski in their theoretical study of the temperature dependence of the paramagnetic resonance line shape function is very difficult to ascertain for the case of a typical paramagnetic crystal. For this reason the approximation method has been investigated for the very simple case of the one-dimensional Ising model. Exact expressions for the line shape function of the model are compared with expressions obtained by the approximation method mentioned above. The agreement between the two expressions is found to be very good in general, and extremely good at very low temperatures.

Etude sur la teneur en pigment de frênes qui croissent dans des conditions différentes

1973 ◽  
Vol 37 ◽  
Author(s):  
N. Lust
Keyword(s):  
Chlorophyll A ◽  
Strong Influence ◽  
The Other ◽  
Pigment Content ◽  
Chlorophyll B ◽  
Light Quantity ◽  
Yellow Pigments ◽  
The One ◽  
Green Pigments

Pigment content of ashes grown up under different circumstances - The pigment content (chlorophyll a, chlorophyll b,  xanthophyll and carotene) has been researched with ashes grown up under  different light circumstances and varying in age and height.     The results prove that the general laws concerning the influence of light  on the pigment content, don’t always work.     The phenomen is very complex. The light quantity is very important in some  cases, but insignificant in others. It seems origin and height of plants have  a strong influence. The results prove also the influence of the environment  is much higher on small plants as on big ones.     The research indicates finally the correlation between the green pigments,  the yellow pigments, and between the green pigments on the one side and the  yellow ones on the other side.

Biexcitons as solitons in the one-dimensional molecular crystal

1981 ◽  
Vol 63 (2) ◽  
pp. 709-723 ◽  
Author(s):  
M. Satarić ◽  
G. Vujičić ◽  
R. Žakula
Keyword(s):  
Molecular Crystal ◽  
One Dimensional ◽  
The One

scholarly journals Laboratory spectral calibration of the TanSat atmospheric carbon dioxide grating spectrometer

2018 ◽  
Vol 7 (3) ◽  
pp. 245-252 ◽  
Author(s):  
Zhongdong Yang ◽  
Yuquan Zhen ◽  
Zenshan Yin ◽  
Chao Lin ◽  
Yanmeng Bi ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Spectral Resolution ◽  
Line Shape ◽  
Atmospheric Carbon Dioxide ◽  
Near Infrared ◽  
Shape Function ◽  
Grating Spectrometer ◽  
Spectral Calibration ◽  
Atmospheric Carbon ◽  
Line Shape Function

Abstract. TanSat is a key satellite mission in the Chinese Earth Observation program and is designed to measure the global atmospheric column-averaged dry-air CO2 mole fraction by measuring the visible and near-infrared solar-reflected spectra. The first Chinese super-high-resolution grating spectrometer for measuring atmospheric CO2 is aboard TanSat. This spectrometer is a suite incorporating three grating spectrometers that make coincident measurements of reflected sunlight in the near-infrared CO2 band near 1.61 and 2.06 µm and in the molecular oxygen (O2) A-band at 0.76 µm. The spectral resolving power (λ∕Δλ) values are ∼19 000, ∼12 800, and ∼12 250 in the O2 A-band, and the weak and strong absorption bands of CO2, respectively. This paper describes the prelaunch spectral calibration of the atmospheric carbon dioxide grating spectrometer aboard TanSat. Several critical aspects of the spectrometer, including the spectral resolution, spectral dispersion, and the instrument line shape function of each channel, which are directly related to producing the Level 1 products are evaluated in this paper. The instrument line shape function of the spectrometer is notably symmetrical and perfectly consistent across all channels in the three bands. The symmetry is better then 99.99 %, and the consistency in the worst case is better then 99.97 %, 99.98 %, and 99.98 % in the O2 A, WCO2, and SCO2 bands, respectively. The resulting variations in the spectral calibrations and the radiometric response errors are negligible. The spectral resolution characterizations meet the mission requirements. The spectral dispersions have excellent consistency in the spatial dimension of each band, and there is good linearity in the spectral dimension of each band. The RMS errors of the fitting residuals are 0.9, 1, and 0.7 pm in the O2 A-band, the WCO2 band, and the SCO2 band, respectively. Taken together, these results suggest that the spectral characterizations of the spectrometer aboard TanSat meet the mission requirements.

NMR Line Shape Function Analysis in Solids

1987 ◽  
Vol 139 (2) ◽  
pp. K137-K140 ◽  
Author(s):  
B. M. Bolotov ◽  
D. A. Aksenov ◽  
A. I. Polyakov ◽  
S. P. Senshin
Keyword(s):  
Line Shape ◽  
Shape Function ◽  
Function Analysis ◽  
Line Shape Function

Measurements of the spectral line shape function and frequency width of longitudinal mode in a multimode gas laser

1996 ◽  
Vol 68 (14) ◽  
pp. 1907-1909
Author(s):  
Jianping Yin ◽  
Jianxing Fang ◽  
Shiqun Zhu ◽  
Weijian Gao ◽  
Yuzhu Wang
Keyword(s):  
Spectral Line ◽  
Line Shape ◽  
Shape Function ◽  
Longitudinal Mode ◽  
Spectral Line Shape ◽  
Gas Laser ◽  
Line Shape Function

scholarly journals HEGEMONY OF MODERNITY IN THE PRACTICE OF USADA BALI TREATMENT IN DENPASAR

2019 ◽  
pp. 14
Author(s):  
Ida Bagus Suatama ◽  
A.A. Ngurah Anom Kumbara ◽  
A.A. Bagus Wirawan ◽  
Ni Luh Arjani
Keyword(s):  
Public Interest ◽  
Qualitative Method ◽  
Strong Influence ◽  
State Regulation ◽  
Medical Discourse ◽  
Traditional Values ◽  
Practice Of Medicine ◽  
The One ◽  
Medical Dominance ◽  
Material Energy

The phenomenon of the hegemony of modernity in the practice treatment of Usada Bali in Denpasar City is interesting to observe. On the one hand, public interest in Usada Bali is still quite high, but also on the other hand modern medical dominance is so strong. Through a postmodernism approach and a qualitative method that relies on the workings of critical theory, its causes, forms, and implications, reveal this phenomenon. The cause of the hegemony of modernity is due to state regulation, the modern and traditional medical dichotomy, the disposition of rationality, and the expansion of material energy. The form of modernity hegemony includes the formalization of medical practices, identity mimesis, praxis of praxis awareness, and commodification of Usada Bali. The implications of the hegemony of modernity includes the strengthening of the existence of Usada Bali, the competition of health services, the reproduction of medical discourse, and the ambivalence of spirituality. This study found that modernity has more power, than traditional values. The discourse of development and empowerment of traditional medicine has not targeted Usada Bali as autonomous knowledge. The violations of sasana balian undoubtedly due to the strong influence of materialism. The existence of Usada Bali is in line with the community’s belief in the etiology of sakala and niskala.   Keywords: Hegemony, Modernity, Practice of Medicine, Usada Bali

Theory of Intercollisional Interference Effects. I. Induced Absorption in a Lorentz Gas

1972 ◽  
Vol 50 (4) ◽  
pp. 352-367 ◽  
Author(s):  
J. Courtenay Lewis ◽  
J. Van Kranendonk
Keyword(s):  
Dipole Moment ◽  
General Theory ◽  
Kinetic Theory ◽  
Shape Function ◽  
Lorentz Gas ◽  
Intermolecular Force ◽  
Interference Effects ◽  
Exponential Functions ◽  
Series Expression ◽  
Line Shape Function

A general kinetic theory of intercollisional interference effects in induced infrared spectra is developed, in which the correlations between all the collisions in the collision sequence of a molecule are taken into account, but the effect of the ternary and higher-order collisions is neglected. The resulting series expression for the line-shape function is explicitly summed for a Lorentz gas. From this general theory expressions are derived for the depth of the intercollisional dip and the shape of the intercollisional spectrum assuming that the pair dipole moment and the intermolecular force are exponential functions with slightly different ranges. The extension of the theory to take into account the frequency dependence of the intracollisional spectrum, and the resulting inadequacy of the neglect of ternary collisions, are discussed.

Sign in / Sign up

Export Citation Format

Share Document