The Water Vapor Molecule

1940 ◽  
Vol 57 (2) ◽  
pp. 128-139 ◽  
Author(s):  
Byron T. Darling ◽  
David M. Dennison
Keyword(s):  
Water Vapor ◽  
Vapor Molecule ◽  
Water Vapor Molecule

The catalytic effect of water, water dimers and water trimers on H2S +3O2formation by the HO2+ HS reaction under tropospheric conditions

2016 ◽  
Vol 18 (26) ◽  
pp. 17414-17427 ◽  
Author(s):  
Tianlei Zhang ◽  
Chen Yang ◽  
Xukai Feng ◽  
Jiaxin Kang ◽  
Liang Song ◽  
...  
Keyword(s):  
Water Vapor ◽  
Catalytic Effect ◽  
Vapor Molecule ◽  
Effect Of Water ◽  
Water Vapor Molecule ◽  
Water Dimers

Catalyst X (X = H2O, (H2O)2and (H2O)3) is incorporated into the channel of H2S +3O2formation and the catalytic effect of water, water dimers and water trimers is mainly taken from the contribution of a single water vapor molecule.

THE VIBRATIONAL CONSTANTS OF ACETYLENE

1948 ◽  
Vol 26a (5) ◽  
pp. 279-291 ◽  
Author(s):  
Norma Morgenroth Nordin ◽  
R. N. H. Haslam
Keyword(s):  
Water Vapor ◽  
Perturbation Methods ◽  
Resonance Interaction ◽  
Vapor Molecule ◽  
Water Vapor Molecule ◽  
Vibrational Energies ◽  
Set Up ◽  
Vibrational Constants ◽  
Work Done

On the basis of the work done by Darling and Dennison on the water vapor molecule, the vibrational constants of acetylene are calculated, taking into account the resonance interaction arising from the near equality of the fundamentals ν1 and ν3. Seventeen band centers are known experimentally. The band centers depend on the 10 constants χi, χik and γ which are functions of the potential constants. The expressions for the vibrational energies of the band centers are set up, those for interacting doublets or triplets being found by perturbation methods. The 10 constants are determined and the positions of eight bands calculated to check the results. The agreement is very satisfactory. The positions of 10 other bands not yet observed are predicted.

Atmospheric chemistry of the self-reaction of HO2 radicals: stepwise mechanism versus one-step process in the presence of (H2O)n (n = 1–3) clusters

2019 ◽  
Vol 21 (43) ◽  
pp. 24042-24053 ◽  
Author(s):  
Tianlei Zhang ◽  
Mingjie Wen ◽  
Yongqi Zhang ◽  
Xinguang Lan ◽  
Bo Long ◽  
...  
Keyword(s):  
Water Vapor ◽  
Atmospheric Chemistry ◽  
Catalytic Effect ◽  
The Self ◽  
Vapor Molecule ◽  
Step Process ◽  
Stepwise Mechanism ◽  
Water Vapor Molecule ◽  
One Step ◽  
Water Dimers

In the incorporation of the catalyst (H2O)n (n = 1–3) into the HO2 + HO2 → H2O2 + 3O2 reaction, the catalytic effect of water, water dimers and water trimers is mainly derived from the contribution of a single water vapor molecule by a stepwise route.

Determination of electrooptical parameters of a water vapor molecule

1976 ◽  
Vol 19 (11) ◽  
pp. 1522-1524
Author(s):  
O. K. Voitsekhovskaya ◽  
Yu. S. Makushkin ◽  
O. N. Sulakshina
Keyword(s):  
Water Vapor ◽  
Vapor Molecule ◽  
Water Vapor Molecule ◽  
Electrooptical Parameters

The Structure of the Water Vapor Molecule

1931 ◽  
Vol 38 (9) ◽  
pp. 1784-1784 ◽  
Author(s):  
E. K. Plyler
Keyword(s):  
Water Vapor ◽  
Vapor Molecule ◽  
Water Vapor Molecule

New Design for a Differentially Pumped Hydration Chamber for a Siemens IA

1971 ◽  
Vol 29 ◽  
pp. 44-45
Author(s):  
R. C. Moretz ◽  
G. G. Hausner ◽  
D. F. Parsons
Keyword(s):  
Electron Microscopy ◽  
Water Vapor ◽  
Electron Diffraction ◽  
Water Vapor Pressure ◽  
Biological Materials ◽  
Thin Membrane ◽  
Reliable System ◽  
System A ◽  
Water Films ◽  
Aperture Opening

Electron microscopy and diffraction of biological materials in the hydrated state requires the construction of a chamber in which the water vapor pressure can be maintained at saturation for a given specimen temperature, while minimally affecting the normal vacuum of the remainder of the microscope column. Initial studies with chambers closed by thin membrane windows showed that at the film thicknesses required for electron diffraction at 100 KV the window failure rate was too high to give a reliable system. A single stage, differentially pumped specimen hydration chamber was constructed, consisting of two apertures (70-100μ), which eliminated the necessity of thin membrane windows. This system was used to obtain electron diffraction and electron microscopy of water droplets and thin water films. However, a period of dehydration occurred during initial pumping of the microscope column. Although rehydration occurred within five minutes, biological materials were irreversibly damaged. Another limitation of this system was that the specimen grid was clamped between the apertures, thus limiting the yield of view to the aperture opening.

Hydration Chamber for Jeolco 200 Kv Microscope

1970 ◽  
Vol 28 ◽  
pp. 542-543
Author(s):  
V. R. Matricardi ◽  
G. G. Hausner ◽  
D. F. Parsons
Keyword(s):  
Electron Microscope ◽  
Water Vapor ◽  
Vapor Pressure ◽  
Pressure Gradient ◽  
Room Temperature ◽  
List Type ◽  
Type Number ◽  
Equilibrium Vapor Pressure

In order to observe room temperature hydrated specimens in an electron microscope, the following conditions should be satisfied: The specimen should be surrounded by water vapor as close as possible to the equilibrium vapor pressure corresponding to the temperature of the specimen.The specimen grid should be inserted, focused and photo graphed in the shortest possible time in order to minimize dehydration.The full area of the specimen grid should be visible in order to minimize the number of changes of specimen required.There should be no pressure gradient across the grid so that specimens can be straddled across holes.Leakage of water vapor to the column should be minimized.

Warm and freeze-fracture of cotton seed radicles

1987 ◽  
Vol 45 ◽  
pp. 984-985
Author(s):  
E. L. Vigil ◽  
E. F. Erbe
Keyword(s):  
Thin Film ◽  
Water Vapor ◽  
Fracture Surface ◽  
Membrane Structure ◽  
Room Temperature ◽  
Freeze Fracture ◽  
Longitudinal Axis ◽  
Fracture Plane ◽  
Cotton Seeds ◽  
Condensed Water

In cotton seeds the radicle has 12% moisture content which makes it possible to prepare freeze-fracture replicas without fixation or cryoprotection. For this study we have examined replicas of unfixed radicle tissue fractured at room temperature to obtain data on organelle and membrane structure.Excised radicles from seeds of cotton (Gossyplum hirsutum L. M-8) were fractured at room temperature along the longitudinal axis. The fracture was initiated by spliting the basal end of the excised radicle with a razor. This procedure produced a fracture through the tissue along an unknown fracture plane. The warm fractured radicle halves were placed on a thin film of 100% glycerol on a flat brass cap with fracture surface up. The cap was rapidly plunged into liquid nitrogen and transferred to a freeze- etch unit. The sample was etched for 3 min at -95°C to remove any condensed water vapor and then cooled to -150°C for platinum/carbon evaporation.

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