A large of flame occurred at Baghjan (27.58309 0 N,95.4018 0 E) as a result of oil well blow out. The present work reports the spectra of the blaze which have been recorded with the help of a Mini USB Spectrometer with spectral range of 200 -1200 nm. Assignments of the prominent emission and absorption peaks have been made. Apart from the absorption bands of water vapour and atmospheric oxygen the presence of sodium emission line has been identified. On the basis of the assumption that Baghjan flame qualifies as a black body the surface temperature of the flame has been estimated to be approximately 4140 0 K. Whispering gallery made in atmosphere has been proposed to explain the roaring sound that can be heard from a distance of 15 Km from the blaze.
Laser induced fluorescence spectra of the polluted samples of water of Brahmaputra river exhibit distinct with peaks at 738, 762, 810, 826, 841, and 929 nm. These band systems exhibit similarity with the infra-red system of silicon fluoride (SiF). It may be inferred that the complexes of silicon contaminated the water samples of Brahmaputra River during the period of December 2017.
In the present work we have studied the Gaussian pattern and its time evolution observed in the diffusion region separating two liquids in a Christiansen cell. It has been observed that there is a definite co-relation between the shape of the Gaussian pattern and the width of the diffusion region. When the diffusion band attains its maximum length, Gaussian pattern nearly vanishes. When laser beam is passed through this region of diffusion, a circular diffraction halo pattern has been observed. The time evolution of these Gaussian patterns will throw much needed light not only on the theory of the Christiansen effect but also to develop an optical technique to measure the rate of diffusion between two molecules.
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