OXIDATION OF IODIDE DURING RELEASE OF STORED ENERGY FROM GAMMA IRRADIATED CRYSTALLINE POTASSIUM BROMIDE IN AQUEOUS IODIDE SOLUTION

The stored energy in the form of color centers is released during dissolution of ?-irradiated crystalline   potassium bromide in aqueous potassium iodide solution. Various parameters like dose, amount and storage time of irradiated potassium bromide which control the yield of iodine have been studied. Similarly, the effect of concentration of potassium iodide has been investigated. The energy transfer parameter has been determined as the ratio of G/I2 obtained by the addition of irradiated crystalline potassium bromide on the basis of oxidation of iodide. Key words: - Irradiation, F-centre, Oxidation, Yield

POLARIZATION LABELLING SPECTROSCOPY OF THE OODR 'E' ←B←\leftarrow B \leftarrow X TRANSITION OF I2I_{2}

$^{1}$ M. D. Danyluk and G.W. King, Chem. Phys, 22, 59-70 (1977).Author Institution:Using sequential laser pulses, the OODR $^{\prime}E^{\prime} \leftarrow B\leftarrow X$ transition of $I_{2}$ has been recorded by polarization labelling spectroscopy at the dispersion of a 3.4m spectrograph. In these experiments, the v^{\prime} = 26-35 levels of the intermediate B state are pumped by the initial pump pulse. The probe pulse then completes the excitation to the higher $^{\prime}E^{\prime}$ state, which initial results indicate consists of a number of neighbouring states, in agreement with the observations of Danyluk and $King^{1}$. Franck-Condon factors cause the well-known E state, with $T_{0} = 41355.8$ $cm^{-1}$, to dominate the spectrum for excitation through levels of the B state at the lower end of the $v^{\prime}$ range given above

Effect of swelling agents on unoriented nylon-6 film-Structural changes

93-99<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" calibri;mso-fareast-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;="" mso-bidi-font-family:"times="" new="" roman";color:black;mso-ansi-language:en-us;="" mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">Unoriented nylon-6 films were subjected to aqueous formic acid and benzyl alcohol treatments. Formic acid was found to be more active in causing structural changes. The highest possible formic acid concentration that could be used advantageously was found to be 50% owing to heavy shrinkage at higher concentrations. Solvent-induced crystallization with respect to time of treatment and concentration of solvent revealed entirely different trends<span style="font-size:11.0pt; line-height:115%;font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;="" mso-fareast-font-family:calibri;mso-fareast-theme-font:minor-latin;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" new="" roman";color:#0f0f0f;mso-ansi-language:="" en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">. These treatments give rise to shrinkage of films. WAXD and IR spectroscopy revealed that crystallization results in the formation of a large amount of monoclinic ɑ-crystalline form. Scanning electron micrographs revealed significant changes in surface morphology due to solvent etching.</span