New method of calculating the perpendicular amplitude correction coefficients from molecular vibration analyses

1973 ◽  
Vol 18 (1) ◽  
pp. 150-151
Author(s):  
S.J. Cyvin
Keyword(s):  
New Method ◽  
Molecular Vibration ◽  
Amplitude Correction

Molecular Vibration Analysis of the Cage-Like Molecules β-P4S5, As4S5, P4S7, and AS2P2S7

1983 ◽  
Vol 38 (9) ◽  
pp. 987-994 ◽  
Author(s):  
S. J. Cyvin ◽  
B. N. Cyvin ◽  
H. Motz ◽  
C. Wibbelmann
Keyword(s):  
Force Field ◽  
Molecular Vibration ◽  
Normal Coordinate ◽  
Mean Amplitudes Of Vibration ◽  
Unknown Compound ◽  
Amplitude Correction ◽  
Symmetry Coordinates ◽  
Complete Set ◽  
The Mean ◽  
Initial Force

Abstract The cage-like molecules β-P4S5 , As4 S5 , P4S7 and As2P2S7 are all supposed to have C2v -symmetry. A normal coordinate analysis was performed for those molecules, based on a very simple initial force field with three numerical parameters and valence coordinates including redundancies. A complete set of symmetry coordinates is given. The force field was refined by adjusting the symmetry force constants to fit exactly a set of observed frequencies. This was used to calculate the mean amplitudes of vibration and perpendicular amplitude correction coefficients. The standard thermodynamical values derived from spectroscopic data are also given. A set of frequencies was calculated for the so far unknown compound P4S6 .

Selective Sampling and Orientation of Non-Homogeneous Tissues

1968 ◽  
Vol 26 ◽  
pp. 98-99
Author(s):  
C. C. Clawson ◽  
L. W. Anderson ◽  
R. A. Good
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Light Microscopy ◽  
Random Sampling ◽  
New Method ◽  
Microscope Examination ◽  
Small Areas ◽  
Selective Sampling ◽  
Large Numbers ◽  
Specific Orientation

Investigations which require electron microscope examination of a few specific areas of non-homogeneous tissues make random sampling of small blocks an inefficient and unrewarding procedure. Therefore, several investigators have devised methods which allow obtaining sample blocks for electron microscopy from region of tissue previously identified by light microscopy of present here techniques which make possible: 1) sampling tissue for electron microscopy from selected areas previously identified by light microscopy of relatively large pieces of tissue; 2) dehydration and embedding large numbers of individually identified blocks while keeping each one separate; 3) a new method of maintaining specific orientation of blocks during embedding; 4) special light microscopic staining or fluorescent procedures and electron microscopy on immediately adjacent small areas of tissue.

A new method for the determination of nitrates

1960 ◽  
Vol 23 ◽  
pp. 227-232 ◽  
Author(s):  
P WEST ◽  
G LYLES
Keyword(s):  
New Method
Sign in / Sign up

Export Citation Format

Share Document