scholarly journals Fluorescent radiation from N 2 O

1934 ◽  
Vol 146 (859) ◽  
pp. 824-828 ◽  
Keyword(s):  
Experimental Data ◽  
Absorption Spectra ◽  
Wave Length ◽  
Metastable States ◽  
Light Quanta ◽  
Long Wave ◽  
Fluorescent Radiation

The action of light on N 2 O was studied by Leifson and continued in recent years by Wulf and Melvin, Dutta, and the present authors from experiments on its absorption spectra. The experimental data so far known indicate that under the action of light quanta of suitable wave-length N 2 O dissociates into a normal NO and N which may be in different excited metastable states as shown below. N 2 O + hv 1 = NO + N ( 4 S) (1) N 2 O + hv 2 = NO + N ( 2 D) (2) N 2 O + hv 3 = NO + N ( 2 P) (3) These processes are inferred from the various starting points of continuous absorptions from a long wave-length limit, and with retransmitted patches of light occurring between these beginnings. The energies corresponding to hv 1 , hv 2 , hv 3 are given by the different long wave beginnings of absorption at λ 2750, λ 1850, and λ 1580; the differences of energy between of these light quanta are respectively the values of 4 S - 2 D 2 D - 2 P of N.

The absorption spectrum of liquid bromine

1937 ◽  
Vol 162 (910) ◽  
pp. 414-419 ◽  
Author(s):  
D. Porret ◽  
Frederick George Donnan
Keyword(s):  
Absorption Spectrum ◽  
Absorption Spectra ◽  
Ground State ◽  
Wave Length ◽  
Electronic States ◽  
Excited Electronic States ◽  
Long Wave ◽  
Liquid Bromine ◽  
Continuous Absorption ◽  
The Continuum

The continuous absorption spectra of gaseous bromine (Peskow 1917; Ribaud 1919; Gray and Style 1929; Acton, Aikin and Bayliss 1936) and of dissolved bromine (Bovis 1929; Gillam and Morton 1929) have been studied many times. They present a wide continuum (from about 30, 000 to 17, 000 cm. -1 .) with a maximum at 24, 000 cm. -1 . For the gas the continuum is preceded by two band systems on the long wave-length side. These systems converge at 19, 585 and 15, 896 cm. -1 . respectively. Acton, Aikin and Bayliss (1936) have shown that the continuum is not simple, and Mulliken (1936) and Darbyshire (1937) have pointed out that there are three overlapping continua corresponding to transitions from the ground state to three different excited electronic states. There are 3 II 0 + ← 1 Σ g , 3 II 1 ← 1 Σ g and 1 II ← 1 Σ g . The absorption spectrum of liquid bromine has been studied by Bovis (1929) form 18, 525 to 31, 750c cm. -1 . and by Camichel (1893) for two frequencies only (16, 978 and 18, 691 cm. -1 ).

III.—The Absorption Spectra of Cyanogen and the Cyanogen Halides

1933 ◽  
Vol 52 ◽  
pp. 152-158 ◽  
Author(s):  
R. B. Mooney ◽  
H. G. Reid
Keyword(s):  
Absorption Spectra ◽  
Wave Length ◽  
Ultra Violet ◽  
Influence Of Temperature ◽  
Long Wave ◽  
Continuous Absorption ◽  
Royal Observatory ◽  
Influence Of Temperature On ◽  
The Cost ◽  
Cyanogen Halides

SummaryThe ultra-violet absorption spectra of C2N2, CNCl, CNBr and CNI have been photographed.Measurements are given of band edges of the C2N2 absorption spectrum in the region 2380 A–1850 A. The influence of temperature on the relative intensities of the bands has been studied.The long wave-length limits of the regions of continuous absorption due to the cyanogen halides are: CNCl, 2240 A; CNBr, 2540 A; CNI, 3100 A and 2150 A.We desire to thank Dr Baker, of the Royal Observatory, Edinburgh, for making photometer records of several spectra, Dr Ludlam for his helpful interest in our work, and Imperial Chemical Industries, Ltd., for a grant towards the cost of quartz apparatus.

scholarly journals On the absorption spectra of some higher oxides

1933 ◽  
Vol 139 (838) ◽  
pp. 397-405 ◽  
Keyword(s):  
Oxygen Atom ◽  
Absorption Spectra ◽  
Light Absorption ◽  
Wave Length ◽  
Long Wave ◽  
Continuous Absorption ◽  
The Difference ◽  
Heat Of Dissociation ◽  
Wave Limit ◽  
Excited Oxygen

Very little work has been done on the absorption spectra of the higher oxides, but recently, one of us has found that SO 3 gives a continuous absorption, beginning from a long wave limit, and after retransmission of a patch of light absorption again sets in. It was postulated that the first long wave limit of absorption by SO 3 marks the photochemical dissociation into SO 2 and normal oxygen atom, according to the equation SO 3 + hv 1 = SO 2 + O ( 3 P). (1) From this formula the heat of dissociation of oxygen was obtained with the help of some thermochemical data. The second long wave limit of absorption was attributed to the dissociation of SO 3 into SO 2 and excited oxygen, according to the process, SO 3 + hv 2 = SO 2 + O ( 1 D 2 ) (2) the difference between the two beginnings of absorption giving approximately the energy of excitation of oxygen from 3 P to 1 D 2 states. In this paper we have studied the absorption spectra of a few more higher oxides, viz., N 2 O 5 , TeO 3 , MoO 3 . As expected, all of them showed the same type of absorption as SO 3 . There was a first absorption on the long wave length side, followed by a patch of retransmitted light, which was again succeeded by a second region of absorption. The methods of procedure are described below.

scholarly journals On the fluorescence and channelled absorption of bismuth at high temperatures

1925 ◽  
Vol 107 (744) ◽  
pp. 760-762 ◽  
Keyword(s):  
Fine Structure ◽  
Absorption Spectra ◽  
High Temperatures ◽  
Royal Society ◽  
Visible Region ◽  
Compressed Air ◽  
Orange Yellow ◽  
Fluorescent Radiation ◽  
Absorption Chamber

In a paper recently communicated to the Royal Society, experiments dealing with the absorption spectra of several metals were described, in which it was found that bismuth vapour shows both lines and bands in absorption. The banded spectrum consists of three groups of bands, each group consisting of a number of bands degraded towards the red, the group of bands in the visible region appearing at high temperatures. In the above experiments it was hoped that by raising the temperature of the absorption chamber sufficiently high, and raising the absorption in the lines of the several bands, it might be possible to detect a fine structure in some of these bands. Accordingly, the author modified the furnace previously used so as to blow through it a larger quantity of compressed air, and succeeded finally by using coke and this furnace to obtain a temperature of about 1500°C. to 1600°C. At this temperature the vapour emitted a fluorescent radiation orange yellow in colour.

SYNTHESIS AND SPECTROSCOPY OF SOME QUATERNARY OXYFLUORIDE GLASSES DOPPED WITH COPPER

2013 ◽  
Vol 22 ◽  
pp. 284-291 ◽  
Author(s):  
CH. SRINIVASU ◽  
M. A. SAMI ◽  
A. EDUKONDALU ◽  
SYED RAHMAN
Keyword(s):  
Optical Absorption ◽  
Absorption Spectra ◽  
Copper Ions ◽  
Wave Length ◽  
Broad Band ◽  
Spin Hamiltonian Parameter ◽  
Band Gap Energy ◽  
Site Symmetry ◽  
Optical Absorption Spectra ◽  
Absorption Data

Electron paramagnetic resonance (EPR) and optical absorption spectra of copper ions in xLiF-(50-x)Li2O-20SrO-30Bi2O3 glass system have been studied. MDSC studies showed that the glass transition temperature decreases with LiF content. Optical absorption spectra of the pure glasses reveled that the cut off wave length increased and optical band gap energy decreased with increase in LiF content. EPR spectra of all the glass samples exhibit resonance signals characteristic of Cu2+ ions. The Cu2+ ions are in well-defined axial sites but subjected to small distortion leading to the broadening of the spectra. The spin-Hamiltonian parameter values indicate that the ground state of Cu2+ is d x2 y2 and the site symmetry around Cu2+ ions is tetragonally distorted octahedral. The optical absorption spectra exhibited a broad band corresponding to the d-d transition bands of Cu2+ ion. By correlating EPR and optical absorption data, the bond parameters are evaluated from various techniques.

Wave Forces on a Stationary Platform of Elliptical Shape

1973 ◽  
Vol 17 (02) ◽  
pp. 61-71
Author(s):  
H. S. Chen ◽  
C. C. Mei
Keyword(s):  
Diffraction Problem ◽  
Wave Length ◽  
Practical Interest ◽  
Vertical Cylinder ◽  
Present Theory ◽  
Wave Forces ◽  
Mathieu Functions ◽  
Body Type ◽  
Elliptical Cross ◽  
Long Wave

Exciting forces and moments due to plane incident waves on a stationary platform are studied in this paper. The platform is a vertical cylinder with a finite draft and elliptical cross section. The mathematical solution to the diffraction problem is obtained on the basis of the linearized long wave approximation. Numerical results via Mathieu functions are presented for a shiplike body with beam-to-length ratio Various draft-to-depth ratios and angles of incidence are considered. Results have been checked with the limiting case of a circular cylinder for the long-wave length range. Aside from its own practical interest, the present theory provides a basis for comparison with other approximate theories of slender-body type and serves as a prelude to the corresponding calculations for arbitrary wavelengths.

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