Fine Structure in the Far Infra-Red Spectrum of NH3

1941 ◽  
Vol 59 (2) ◽  
pp. 171-173 ◽  
Author(s):  
H. M. Foley ◽  
H. M. Randall
Keyword(s):  
Fine Structure ◽  
Infra Red

Vibration-rotation bands of nitrous oxide

1951 ◽  
Vol 208 (1094) ◽  
pp. 326-331 ◽  
Keyword(s):  
Nitrous Oxide ◽  
Fine Structure ◽  
Ground State ◽  
Wave Length ◽  
The Other ◽  
Resolving Power ◽  
Microwave Measurements ◽  
Rotational Constants ◽  
Infra Red ◽  
Vibration Rotation

The infra-red absorption of nitrous oxide gas near 4·5 μ has been re-investigated using high resolving power. The rotational fine structure has been split up and shown to involve two vibrational transitions, one due to absorption of a fundamental from the ground state, and the other to a π → π transition from an excited vibrational level. The transitions have been analyzed theoretically and rotational constants obtained. The results serve to emphasize the importance of using more precise wave-length standards for infra-red measurements than have been used hitherto, if the rotational constants are to be obtained with accuracy com­parable to that achieved by microwave measurements. Excellent agreement with the latter has now been found.

Vibration-rotation bands of methane

1952 ◽  
Vol 213 (1112) ◽  
pp. 42-54 ◽  
Keyword(s):  
Complex System ◽  
Absorption Spectrum ◽  
Fine Structure ◽  
Resolving Power ◽  
Absorption Bands ◽  
Infra Red ◽  
Vibration Rotation

The infra-red absorption spectrum of methane 12 CH 4 in the region of 3 μ has been re-investigated with higher resolving power than has been used previously. A very complex system of overlapping vibration bands has been revealed. The rotational fine structure of these bands has been partially analyzed, particularly having regard to the Coriolis interactions which occur in this case. The corresponding absorption bands of 13 CH 4 have also been examined.

scholarly journals Fine structure of the Raman lines of carbon tetrachloride

1939 ◽  
Vol 172 (948) ◽  
pp. 89-94 ◽  
Keyword(s):  
Fine Structure ◽  
Raman Spectrum ◽  
Carbon Tetrachloride ◽  
Normal Mode ◽  
Raman Effect ◽  
Normal Modes ◽  
Chlorine Atoms ◽  
Infra Red

Assuming first of all for simplicity that the four chlorine atoms are identical, the greatest symmetry the CCl 4 molecule could have is T d . This would lead us to anticipate four fundamentals, v 1 , v 2 , v 3 , v 4 belonging to normal modes A 1 , E , F 2 , F 2 , respectively, using Placzek’s (1934) nomenclature. A 1 is the total symmetric normal mode, and so v 1 is polarized in the Raman effect, and inactive in the infra-red. A 1 is a singlet mode. E is a doublet mode and v 2 is depolarized in the Raman effect, while it is inactive in the infra-red. F 2 is a triplet mode and v 3 and v 4 are depolarized in the Raman effect and are also active in the infra-red. If the Raman spectrum of CCl 4 is examined under coarse dispersion, lines are observed at 217, 314, 459 cm. -1 , identified as v 2 , v 4 and v 1 respectively. Two at 760 and 790 cm. -1 are usually regarded as the result of resonance degeneracy between v 3 and ( v 1 + v 4 ), both in the mode F 2 .

Fine Structure of Platelet Interaction with a New Microcrystalline Collagen Preparation

1974 ◽  
Vol 32 ◽  
pp. 58-59
Author(s):  
W. H. Zucker ◽  
R. G. Mason
Keyword(s):  
Fine Structure ◽  
Platelet Aggregation ◽  
Hydrochloric Acid ◽  
Whole Blood ◽  
Platelet Adhesion ◽  
Hemostatic Agent ◽  
Native Collagen ◽  
Fibrillar Morphology ◽  
Clinical Interest ◽  
New Form

Platelet adhesion initiates platelet aggregation and is an important component of the hemostatic process. Since the development of a new form of collagen as a topical hemostatic agent is of both basic and clinical interest, an ultrastructural and hematologic study of the interaction of platelets with the microcrystalline collagen preparation was undertaken.In this study, whole blood anticoagulated with EDTA was used in order to inhibit aggregation and permit study of platelet adhesion to collagen as an isolated event. The microcrystalline collagen was prepared from bovine dermal corium; milling was with sharp blades. The preparation consists of partial hydrochloric acid amine collagen salts and retains much of the fibrillar morphology of native collagen.

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