Ultra-Violet Absorption Spectrum of Water

Nature ◽  
1961 ◽  
Vol 189 (4759) ◽  
pp. 132-132
Author(s):  
R. M. GOLDING
Keyword(s):  
Absorption Spectrum ◽  
Ultra Violet

scholarly journals Ultra-violet transparency of the lower atmosphere, and relative poverty in Ozone

1918 ◽  
Vol 94 (660) ◽  
pp. 260-268 ◽  
Keyword(s):  
Absorption Spectrum ◽  
Solar Spectrum ◽  
Ultra Violet ◽  
Lower Atmosphere ◽  
Atmospheric Ozone ◽  
Absorption Bands ◽  
Relative Poverty ◽  
Narrow Bands

Many years ago it was suggested by Hartley* that the limit of the solar spectrum towards the ultra-violet was attributable to absorption by atmospheric ozone, which, as he showed, would give rise to a general absorption beginning at about the place where the solar spectrum ends. In a recent paper by Prof. A. Fowler and myself,† the evidence for this view was very much strengthened. For it was shown that just on the limits of extinction the solar spectrum shows a series of narrow absorption bands which are eventually merged in the general absorption, and these narrow bands are precisely reproduced in the absorption spectrum of ozone. For my own part, I do not feel any doubt that ozone in the atmosphere is the effective cause limiting the solar spectrum.

The absorption spectrum of SO and the flash photolysis of sulphur dioxide and sulphur trioxide

1959 ◽  
Vol 249 (1259) ◽  
pp. 498-512 ◽  
Keyword(s):  
Absorption Spectrum ◽  
Dissociation Energy ◽  
Sulphur Dioxide ◽  
Flash Photolysis ◽  
Ultra Violet ◽  
Vibrationally Excited ◽  
A Value ◽  
Continuous Absorption ◽  
Sulphur Trioxide ◽  
Normal Spectrum

The flash photolysis of sulphur dioxide under adiabatic conditions results in the complete temporary disappearance of its spectrum , which then slowly regains its original intensity over a period of several milliseconds. Simultaneously with the disappearance of the sulphur dioxide spectrum a continuous absorption appears in the far ultra-violet and fades slowly as the sulphur dioxide reappears. It is shown that the effect of the flash is thermal rather than photochemical, and the possibility of the existence of an isomer of sulphur dioxide at high temperatures is discussed; the disappearance of the normal spectrum on flashing is explained in this way. Several previously unrecorded bands of SO observed in the photolysis indicate that the vibrational numbering of its spectrum should be revised by the addition of 2 to the present values of v' . This leads to a value of the dissociation energy of 123.5 kcal. In formation about the levels v' = 4, 5 and 6 has also been obtained. The isothermal flash photolysis of sulphur trioxide results in the appearance of vibrationally excited SO, and the primary photochemical step in this reaction is discussed.

scholarly journals The Absorption Spectrum of Benzene in the Ultra-violet Region

Nature ◽  
1905 ◽  
Vol 72 (1878) ◽  
pp. 630-631
Author(s):  
E. C. C. BALY ◽  
J. NORMAN COLLIE
Keyword(s):  
Absorption Spectrum ◽  
Ultra Violet

scholarly journals Ultra-violet Absorption Spectrum and Chemical Reactivity of some Substituted 9-Vinyl-Phenanthrenes

Nature ◽  
1939 ◽  
Vol 143 (3616) ◽  
pp. 278-278 ◽  
Author(s):  
VICTOR HENRI ◽  
ERNST BERGMANN
Keyword(s):  
Absorption Spectrum ◽  
Chemical Reactivity ◽  
Ultra Violet

STUDIES ON THE DETERMINATION OF PENTOSANS BY ULTRA-VIOLET ABSORPTION SPECTRUM

1958 ◽  
Vol 14 (12) ◽  
pp. 914-919
Author(s):  
Masamichi Okubo ◽  
Koji Nakajima ◽  
Takuji Yoshiwara
Keyword(s):  
Absorption Spectrum ◽  
Ultra Violet

scholarly journals Photochemical reactions in the fluorite region II─Photochemical decomposition of formaldehyde vapour

1937 ◽  
Vol 163 (913) ◽  
pp. 221-227 ◽  
Keyword(s):  
Carbon Monoxide ◽  
Absorption Spectrum ◽  
Ground State ◽  
Wave Length ◽  
Ultra Violet ◽  
Photochemical Reactions ◽  
Photochemical Decomposition ◽  
The Subject ◽  
Region Ii ◽  
Formaldehyde Vapour

The photochemical decomposition of formaldehyde in the near ultra­-violet has been the subject of several investigations. It is known (Norrish and Kirkbride 1932) that the products are chiefly carbon monoxide and hydrogen, and that neither the composition of the products nor the quantum yield depends appreciably on wave-length. Recently Price (1935) has investigated the far ultra-violet absorption spectrum of formaldehyde. The first band observed in this region occurs at about 1745 A and is very diffuse, whereas the first bands in acetaldehyde (Price 1935) and acetone (Noyes, Duncan and Manning 1934) occur at longer wave-lengths and are relatively much sharper. Price ascribes this diffuseness to a predissociation resulting from the interaction of the upper state in formaldehyde with the ground state and assumes that the primary dissociation at about 1745 A should be CH 2 O → hv 1745 A CH 2 + O.

scholarly journals THE PHOTOTROPIC SENSITIVITY OF PHYCOMYCES AS RELATED TO WAVE-LENGTH

1931 ◽  
Vol 14 (6) ◽  
pp. 701-711 ◽  
Author(s):  
E. S. Castle
Keyword(s):  
Absorption Spectrum ◽  
Wave Length ◽  
Ultra Violet ◽  
Photosensitive Substance

Under the circumstances of experimentation described, the sporangiophores of Phycomyces are found to be most sensitive to stimulation by light in the violet between 400 and 430 mµ. Toward the red, sensitivity falls to nearly zero near 580 mµ, while in the near ultra-violet around 370 mµ, sensitivity is still high. The previous experiments of Blaauw had placed the point of greatest sensitivity some 80 mµ nearer the red end of the spectrum. Because of the known presence in the sporangiophores of Phycomyces of "accessory" pigments, care must be taken in identifying such results with the absorption spectrum of the photosensitive substance.

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