1979 International Conference on Submillimeter Waves and Their Applications最新文献

{"title":"Submillimetre Absorption of Electrolyte Solutions","authors":"M. Bennouna, H. Cachet, C. Gastaud, M. Redon","doi":"10.1109/ICSWA.1979.9335334","DOIUrl":"https://doi.org/10.1109/ICSWA.1979.9335334","url":null,"abstract":"This work is a part of a research plan of the GR4/CNRS, concerning the study of ion-ion and ion-solvent interactions in electrolyte solutions. In a first step, information have been obtained by dielectric relaxation and conductivity measurements about (i) the ionic association (ii) the perturbation of Debye rotation by ionic solvation [1]. Now, our purpose is to undertake investigations about the absorption processes in such materials which occur at times shorter than 10−12s corresponding to the submillimeter wavelength range. Previous works have already shown the interest of the far infrared (FIR) spectroscopy applied to electrolyte solutions, essentially in two directions. At first, for tetraalkylammonium halides solutions in non polar solvents, a strong absorption has been shown to arise from interionic vibrations providing a possible way to test ionic pair potential models [2]. Secondly, numerous investigations have been made about the strong absorption band ascribed to solvated cations. This band due to the short range cation-solvent interactions peaks around 400 cm−1 for Li+ and at wavenumbers lower or equal to 200 cm−1 for the other alkaline cations. In this paper, we present power absorption coefficient data a at wavenumbers lower than 320 cm−1 for lithium salts solutions in various polar solvents : tetrahydrofuran (THF), 1,3-dioxolan, 1,2-dimethoxyethane. Lithium salts solutions have been chosen in order to avoid an undesirable overlap with the solvated cation band. Such spectral measurements are very difficult with the usual FIR low power sources because these liquids are very absorbing. All polar solvents exhibit a broad, strong absorption band generally ascribed to the libration of dipoles in the cage constituted by the surrounding molecules. Its maximum is situated in the 30-100 cm−1 region. Another difficulty is we need to compare the solvent and solution spectra in order to evidence the effects of the solute. In these conditions, we have decided to combine the use of a conventional Fourier transform interferometer and a FIR spectrometer to cover the range 20-320 cm−1.","PeriodicalId":216123,"journal":{"name":"1979 International Conference on Submillimeter Waves and Their Applications","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125399966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Observations of Far-Infrared Fine Structure Lines in the Interstellar Medium","authors":"D. Watson, J. Storey, C. Townes","doi":"10.1109/ICSWA.1979.9335408","DOIUrl":"https://doi.org/10.1109/ICSWA.1979.9335408","url":null,"abstract":"Fine structure lines in the far-infrared have many simple properties that make them useful tools for diagnosing astrophysical plasmas. The line ratios are sensitive and accurate probes of density, elemental abundances, and ionization structure; also, line shapes and Doppler shifts have proven handy in studies of gross dynamics of H II regions and galaxies. These lines have several analytical and practical advantages over spectral features in the optical and radio regions for measuring certain parameters of ionized regions.","PeriodicalId":216123,"journal":{"name":"1979 International Conference on Submillimeter Waves and Their Applications","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114503223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Infrared Absorption Spectra of Compensated Single Crystal Silicon using a Fourier Transform Spectrometer","authors":"D. Mead","doi":"10.1109/ICSWA.1979.9335322","DOIUrl":"https://doi.org/10.1109/ICSWA.1979.9335322","url":null,"abstract":"The infrared absorption spectra of crystalline silicon containing some impurities have been studied in the 200 to 2000 cm−1 region using Fourier transform infrared (FTIR) techniques. The excitation spectra associated with the group III acceptor impurities boron and indium and the group V donors, antimony and phosphorus, have been studied at helium temperatures. Fig. 1 shows the schematic and highly simplified energy momentum diagram, and the various electronic transitions due to shallow donors and acceptor (hole transition) centers. Fig. 2 shows the room and 15K spectra of compensated silicon some 0.12 inches thick. The most significant change in the low temperature spectrum is the decrease in absorption and the addition of intense bands in the far infrared region. Fig. 3 shows an expanded plot of two samples at 15K in the 450-150 cm−1 region, in which the P3/2 set of transitions for boron are observed. A line seen at 316.1 cm−1 is that of phosphorus, which may be compared to previous measurements [1] using grating spectrometers.","PeriodicalId":216123,"journal":{"name":"1979 International Conference on Submillimeter Waves and Their Applications","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129478339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pressure Broadening and Shifting of Rotation and Rotation-Vibration Spectral Lines of HCL by Noble Gases","authors":"R. Leavitt, E. Salesky","doi":"10.1109/ICSWA.1979.9335430","DOIUrl":"https://doi.org/10.1109/ICSWA.1979.9335430","url":null,"abstract":"Shifts of the line positions of the 2-0 band of HCl perturbed by noble gases, first measured in 1960 [1,2], were later augmented [3-10] by measurements of linewidths and shifts in the pure rotational and rotation-vibration spectra. To explain the experimental results, several theoretical calculations were performed [11-18] that used primarily the Anderson-Tsao-Curnutte (ATC) theory [19,20]. Whereas qualitative agreement with experiment was obtained, the quantitative agreement was poor.","PeriodicalId":216123,"journal":{"name":"1979 International Conference on Submillimeter Waves and Their Applications","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123997593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Energy Losses from Building Envelopes by Heat Radiation and their Countermeasures","authors":"Ch. Zürcher, F. Thiébaud, G. Finger, F. Kneubühl, T. Frank","doi":"10.1109/ICSWA.1979.9335346","DOIUrl":"https://doi.org/10.1109/ICSWA.1979.9335346","url":null,"abstract":"The energy consumption of buildings depends on the infrared (IR) properties of both the atmosphere and the building envelope. The energy balance for a building's skin [1, 2]: ε σ T<inf>0</inf>⁴ = k' (T<inf>i</inf>-T<inf>0</inf>) + α<inf>k</inf> (T<inf>a</inf>-T<inf>0</inf>) + εJ + α<inf>s</inf> J<inf>s</inf> states that in the steady state the power lost by IR radiation equals the incident power. The energy influx from the inside of the building k' (T.-T), atmospheric counterradiation εJ (long-wave), total absorbed solar radiation α<inf>S</inf> J<inf>S</inf> (short-wave) and convective heat transfer α<inf>k</inf> (T<inf>a</inf> -T<inf>o</inf>).","PeriodicalId":216123,"journal":{"name":"1979 International Conference on Submillimeter Waves and Their Applications","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124035520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"FIR Collective Scattering from the UCLA Microtor Tokamak","authors":"A. Semet, A. Mase, W. Peebles, N. Luhmann","doi":"10.1109/ICSWA.1979.9335341","DOIUrl":"https://doi.org/10.1109/ICSWA.1979.9335341","url":null,"abstract":"The anomalous transport and energy loss observed in present toroidal magnetic fusion confinement devices may be due to low frequency microturbulence [1]. One way of studying such turbulence has been to scatter microwave or CO2 laser radiation from small-scale density fluctuations [2-8]. As long as the scattering parameter α = 1/kλD ≃ λO/4Πλ sin(θ/2) ≳ 1, one obtains information about collective fluctuations. The problem with both CO2 and microwave scattering is that if one satisfies the abovementioned criterion it is not possible to simultaneously provide a localized scattering measurement and good wavenumber resolution. On the other hand, FIR laser scattering is ideally suited to magnetic fusion parameters and easily provides spatial resolution Δx ≃ 1.5-3 cm while providing wavenumber resolution Δk ≳ 3 cm−1 FWHM. An additional bonus arises from the ease of changing incident laser wavelength, thereby increasing the range of instability wavenumbers which can be investigated (k ≃ 4Πsin(θ/2)/λO).","PeriodicalId":216123,"journal":{"name":"1979 International Conference on Submillimeter Waves and Their Applications","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122051377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Near-Millimeter-Wave Polarizing Wire Grid Fabrication and Evaluation","authors":"G. Simonis, F. Weiser, G. Wood","doi":"10.1109/ICSWA.1979.9335455","DOIUrl":"https://doi.org/10.1109/ICSWA.1979.9335455","url":null,"abstract":"The wavelengths in the near-millimeter wavelength region (NMMW — roughly 0.3 to 3 mm) are sufficiently small that the conventional microwave fundamental-mode waveguide techniques are difficult to implement and are often of limited effectiveness. Quasi-optical components are frequently employed to overcome these difficulties. Free-standing planar one-dimensional wire grids show promise, based on their strong polarizing properties, in the fabrication of many such components. In this paper we discuss a straight-forward method of fabrication of one-dimensional wire grids that has been employed on a normal machine shop lathe to produce grids of sufficient quality for many NMMW applications. Examination of their mechanical quality and NMMW performance is also presented.","PeriodicalId":216123,"journal":{"name":"1979 International Conference on Submillimeter Waves and Their Applications","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122283339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Submm Stark Spectroscopy of Methanol","authors":"M. Inguscio, A. Moretti, G. Moruzzi, F. Strumia","doi":"10.1109/ICSWA.1979.9335421","DOIUrl":"https://doi.org/10.1109/ICSWA.1979.9335421","url":null,"abstract":"A systematic investigation of the Stark effect on the optically pumped CH3OH FIR laser lines is carried on in our laboratory. CH3OH was selected among many other molecules because i) it has the largest number of laser lines, ranging from 37.5 μm up to the mm region, ii) many of these lines are very strong.iii) CH3OH has a complex spectrum, and a new approach with complementary information will be a valuable help in order to get a deeper insight.","PeriodicalId":216123,"journal":{"name":"1979 International Conference on Submillimeter Waves and Their Applications","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132338980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Submillimeter Model Measurements and their Applications to Millimeter Radar Systems","authors":"J. Waldman, H. Fetterman, P. E. Duffy, T. G. Bryant, P. Tannenwald","doi":"10.1109/ICSWA.1979.9335344","DOIUrl":"https://doi.org/10.1109/ICSWA.1979.9335344","url":null,"abstract":"A submillimeter-based modeling system has been developed and employed to obtain imaging and radar cross section (RCS) measurements of scale model targets. In these demonstration experiments three submillimeter frequencies at 1288, 2542, and 3125 GHz, obtained from a CO2 optically pumped CH3OH laser were used to model 37, 70, and 90 GHz, respectively. In addition, a CD3OH laser line at 37.6 μm (7980 GHz) has been used to extend these measurements up to 228 GHz. The results obtained demonstrate that the system is capable of providing quantitative radar data.","PeriodicalId":216123,"journal":{"name":"1979 International Conference on Submillimeter Waves and Their Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130143447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Far Infrared Faraday Rotation Measurement CN ZT-40","authors":"M. D. Bausman, P. Forman, F. Jahoda, R. W. Peterson","doi":"10.1109/ICSWA.1979.9335457","DOIUrl":"https://doi.org/10.1109/ICSWA.1979.9335457","url":null,"abstract":"The poloidal magnetic field in ZT-40 (LASL's newest toroidal reversed-field-pinch controlled fusion experiment) is being measured by Faraday rotation of the 164 micron emission of a CO2-pumped CH3OH laser. The essence of this method, which is independent of spurious intensity modulations, is to monitor the phase distortion of a regular beat frequency. This beating is produced when two oppositely circularly polarized components, frequency shifted with respect to each other and both passed through a magnetized plasma, are transmitted through a linear polarization analyzer. The same concept has been independently described by Dodel and Kunz [1].","PeriodicalId":216123,"journal":{"name":"1979 International Conference on Submillimeter Waves and Their Applications","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130704296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}