Submillimeter Wave

Nuss M C and Orenstein J 1998 Terahertz time domain spectroscopy Millimeter Submillimeter Wave Spectrosc. Solids 74 7-50... 

Much has been learned in recent years about the 00 dimer , O2O2, produced in reaction 17. It is actually dichlorine peroxide, OOOCl its geometry is now well established from submillimeter wave spectroscopy (15). Photolysis of OOOO around 310 nm the atmospherically important wavelengths -- yields chlorine atoms and ClOO radicals (16), as given in reaction 18, rather than two OO radicals, even though QO-OQ is the weakest bond (it has a strength of about 17 Kcal/mol (17)). Thermal decomposition of QOOQ (the reverse of reaction 17) occurs very fast at room temperature, but more slowly at polar stratospheric temperatures. Hence, photolysis is the predominant destruction path for CIOOQ in the polar stratosphere and two Q atoms are produced for each ultraviolet photon absorbed. 

K. C. Allen and H. J. Liebe. Tropospheric Absorption and Dispersion of Millimeter and Submillimeter Waves IEEE Trans. Antennas Propagat., Vol. 31, pp. 221-223, January 1983. 

G.F. Brand. Development and Applications of Frequency Tunable, Submillimeter Wave Gyrotrons , Int. J. Infrared and Millimeter Waves Vol. 16, pp. 879-887, 1995. 

T. Baba, T. Tanaka, I. Morino, K. M. T. Yamada, and K. Tanaka, Detection of the tunneling rotation transitions of malonaldehyde in the submillimeter wave region. /. Chem. Phys. 110, 4131 4133 (1999). 

In Figs. 50 and 51 we illustrate the effect of a-dispersion in terms of ionic contribution to the e (v) spectrum, calculated for the lowest concentration 0.5 mol liter-1. In Figs. 50a,c and Figs. 51a,c we see that additional loss As"on(v) arises due to this dispersion. This loss increases (especially for NaCl) if ionic lifetime Xion becomes longer. For Xion = lOx the additional loss appears at millimeter waves, while for Xion = x it appears at submillimeter waves. 

M. C. L. Gerry, F. Stroh, and M. Winnewisser, J. Mol. Spectrosc., 140, 147 (1990). The Microwave Fourier Transform, Millimeter-Wave, and Submillimeter-Wave Rotational Spectra of Isocyanogen, CNCN. 

H. Eisele and R. Kamoua, Submillimeter-wave InP Gunn devices, IEEE Transactions on Microwave Theory and Techniques, vol. 52, pp. 2371, 2004. 

Laser devices have become of great importance in chemical studies and applications and, before discussing some of the applications of lasers in kinetic measurements, it is worth reviewing the fundamental characteristics of a laser. Many different substances have been found to exhibit laser action when suitably pumped and lasers are now available at thousands of wavelengths from the vacuum ultraviolet to the submillimeter wave region. Figure 1 shows some of the lasers which can be used in... 

Fig. 17. Energy levels of the rotation-inversion spectrum of ammonia. The quantum numbers (J,K) are given for each level. The heavy arrows indicate the inversion transitions detected in interstellar space and their frequencies in MHz. Thin arrows indicate the rotation-inversion transitions located in the submillimeter wave region. Dashed arrows indicate some collision induced transitions...

GHz, i.e. they should appear in the submillimeter wave region. Although their intensity should be very small (-y 10 cm ), the submillimeter spectrometer built by Krapnov et al. using the acoustic detector might have been able to detect these transitions. In a search for the weak transitions, the fact could be used that the frequency separation of the a(/+ 1, A 3) - - (/, k) and s(/+ 1, A 3) <- (J, k) transitions can be determined with microwave accuracy from the known inversion frequencies in the ground vibrational state of ammonia (see Fig. 8). 

By using a combination of gas-phase synthesis and millimeter/submillimeter-wave spectroscopy, LiNH2 was found to be a monomeric unsolvated planar molecule. The lithium amide [H2NCH2CH2N(H)Li]co has a polymeric ladder structure with two types of (NLi)2 ring which alternate throughout its infinite length. ... 

The rotational transition spectrum of KF(g) has been measured in the millimeter- and submillimeter-wave region with a high resolution molecular-beam absorption spectrometer by Veazey and Gordy (IJ ). From the derived potential constants the vibrational constants were calculated. The reported values for u. u> x. B. a and r are adopted. 

Keywords Biological and chemical agents, remote detection, sensing and imaging, millimeter and submillimeter wave, THz spectrometer, superconductor, RSFQ. 

T. Globus, M. Bykhovskaia, D. Woolard and Boris Gehnont, Submillimeter-wave Absorption Spectra of Artificial RNA Molecules, Jo nia/ of Physics D, 36,1314-1322 (2003). 

Hirao, T. and Amano, T. (2003). Laboratory submillimeter-wave detection of D2H+ a new probe into multiple deuteration Astrophysical Journal, 597, L85. 

Lewen F, Gendriesch R, Pak I, Paveliev D G, Hepp M, Schider R and Winnewisser G 1998 Phase locked backward wave oscillator pulsed beam spectrometer in the submillimeter wave range Rev. Sci. Instmm. 69 32-9... 

Effective rotational and centrifugal distortion as well as Coriolis coupling parameters were determined from the millimeter-wave, submillimeter-wave and infrared Fourier transform spectra in the grotmd and excited stretching and torsional states. 

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