Interaction of 4 μm laser beam with absorption lines of sulphur dioxide

617-620Interaction of a free electron laser beam of wavelength 4 μm with rotational lines of sulphur dioxide has been studied. Values of transmittance, averaged over intervals of 0.1 cm⁻¹, are obtained for absorber thickness 0.01, 0.1 and 1 atm-cm, using the quasi-random model of molecular band absorption. From these values, intensities of the high resolution absorption lines of SO₂ are simulated in the frequency interval 2499.0115 – 2499.9910 cm⁻¹

Variation of width of the hysteresis loop with temperature in an emitter-coupled Schmitt trigger

482-485Schmitt trigger circuits are designed with pnp transistors: the first circuit with two 2SB324 germanium transistors, and the second one with two U188 silicon transistors. At certain collector resistances in the second stage- or the driven- transistor, the variations of the hysteresis loop width in temperature range –95-75° C for the first circuit, and 100-150°C for the second one have been observed. The increase in the loop width with temperature is shown

X-ray diffraction and Fourier transform infrared spectra of the bricks of the Kamakhya temple

745-748The Kamakhya temple is a favoured destination for almost all the tourists visiting the north eastern part of India. Bricks obtained from both protected (old) and new sites of the Kamakhya temple have been analysed by X-ray diffraction (XRD) and Fourier transform infrared (FTIR) techniques. XRD patterns of the bricks confirm quartz to be one of the constituents. Along with quartz, calcium aluminium silicate comes out as the maximum mineral composition in the sample from the old site, while other minor phases of calcium aluminium silicate and iron phosphate hydrate show their presence in the sample from the new site. The FTIR spectrum of the new site sample reveals an iron oxide band at 554 cm-1, which is absent in the spectrum of the one from the protected site. From this band as well as bands arising due to Si-O-Si stretching vibrations at 1038 and 1084 cm-1, the firing temperature of the bricks of both sites is estimated to be around 500°C.<b style="mso-bidi-font-weight: normal"> </span

<span style="font-size:14.0pt;line-height: 115%;font-family:"Times New Roman";mso-fareast-font-family:"Times New Roman"; color:black;mso-ansi-language:EN-IN;mso-fareast-language:EN-IN;mso-bidi-language: HI" lang="EN-IN">Propagation of dye laser beam through <i>p</i>-benzoquinone-H₄ vapour</span>

231-234<span style="font-size:14.0pt;line-height: 115%;font-family:" times="" new="" roman";mso-fareast-font-family:"times="" roman";="" color:black;mso-ansi-language:en-in;mso-fareast-language:en-in;mso-bidi-language:="" hi"="" lang="EN-IN">Interaction of a tunable dye laser beam with p-benzoquinone-H4 lines has been studied in the frequency range 17800-24900 cm-1. Values of transmittance, averaged over intervals of 25cm-1, are obtained for three different path lengths— using the quasi-random model of molecular band absorption. From these values, intensities of the absorption lines are simulated.</span

Glow peaks of Re (Re = Eu, Ce) doped CaF₂ relevant to dosimetry

609-613Glow peaks of Re-doped (Re = Eu, Ce) have been studied for their relevance to dosimetry. All the key parameters that are essential in predicting the stability of glow peaks are evaluated by Computerised Glow Curve Deconvolution (CGCD). Unlike most of the earlier works, in this study the importance of order of kinetics (b) is considered keeping the recent development in mind. Finally, the values of the parameters evaluated are examined, considering the solid-state aspect of defects in the material

Glow peaks of Re (Re = Eu, Ce) doped CaF2 relevant to dosimetry

Glow peaks of Re-doped (Re = Eu, Ce) have been studied for their relevance to dosimetry. All the key parameters that are essential in predicting the stability of glow peaks are evaluated by Computerised Glow Curve Deconvolution (CGCD). Unlike most of the earlier works, in this study the importance of order of kinetics (b) is considered keeping the recent development in mind. Finally, the values of the parameters evaluated are examined, considering the solid-state aspect of defects in the material

Interaction of dye laser beam of wavelength 5750 Å with absorption lines of nitrogen

509-511The quasi-random model of molecular band absorption is used to study the interaction of dye laser beam of wavelength 5750 Å with the absorption lines of nitrogen. The values of transmittance, averaged over intervals of 0.2 cm-1, are obtained for two different path lengths in the frequency range 17386 – 17397 cm-1. From these values, the intensities of the absorption lines in the first positive system of N2 have been simulated

Trap spectroscopy and thermoluminescence of CaF₂ based TLDs

13-18A comprehensive picture of trap-spectroscopy of CaF2 based TLDs namely natural CaF2, CaF2:Dy (TLD-200), CaF2:Tm (TLD-300) and CaF2:Mn (TLD-400) has been presented in the paper. We demonstrate that all the CaF2 based TLDs have some common characteristics in terms of trap-depths relevant to dosimetry. Unlike most of the studies, the role of the frequency factor (s) and the order of kinetics (b) that decide critically the stability of relevant glow peaks have been examined. This has been achieved by performing deconvolution of the entire glow curves of the systems and subjecting the criteria of acceptance of curve-fitting not only by considering ‘Figure of Merit’ (FOM) but rigorous statistical tests