Spectroscopy fourier transform microwave

The interaction of dihalogen molecules XY with different acceptors B quite often leads to vicious chemical reactions. In most cases, the 1 1 complexes are extremely short-lived. To investigate these prereactive complexes experimentally in a collision-free environment, pulsed-nozzle, Fourier-transform microwave spectroscopy has turned out to be the ideal technique. Legon and coworkers prepared a large number of these complexes and performed detailed rotational spectroscopic analyses. Several series of simple molecules... 

J. P. I. Hearn, R. V. Cobley, and B. J. Howard, High resolution spectroscopy of induced chiral dimers A study of the dimers of ethanol by Fourier transform microwave spectroscopy. J. Chem. Phys. 123, 134324 (2005). 

Fourier-transform microwave spectroscopy, pulsed-nozzie, 46 114-115 Four-iron clusters, see Density, functional theory... 

The properties of weakly bonded van der Waals complexes in reactive systems are studied by pulsed Fourier Transform microwave spectroscopy, which is a powerful tool for investigating many complexes. 

The rotational spectra of the thietane/HCl complex have been registered by Fourier transform microwave spectroscopy <2001AGE935, 2002CEJ4265>. It was found that the equivalence of the nonbonding pairs at sulfur is broken by complexation as a consequence of the appearance of axial and equatorial conformers in the thietane-HC1 complex. Several aspects on the axial and equatorial structures have been discussed <2001AGE935, 2002CEJ4265>. 

III Pulsed Molecular Beam, Fourier Transform Microwave Spectroscopy 89... 

Legon AC (1983) Pulsed-nozzle Fourier transform microwave spectroscopy of weakly bound dimers. Ann Rev Phys Chem 34 275-300... 

In 2008, Alonso and coworkers reported a combined experimental and computational study of the conformations of cysteine. They located 11 low lying conformers at MP4/6-311-i i-G(d,p)//MP2/6-311-l-l-G(d,p), and the five lowest energy structures are shown in Table 3.15. Using laser ablation molecular beam Fourier transform microwave spectroscopy, they identified six conformers present in the gas phase. Comparing the computed rotational constants and nuclear quadrupole coupling tensor components with the experiment, they were able to decidedly match up all six experimental conformers with computed structures. Of the five low energy conformers listed in Table 3.15, four of them were identified in the experiment. 

Alonso et al. examined the glycine-one water complex using laser ablation molecular beam Fourier-transform microwave spectroscopy. By comparison of the observed rotational parameters and those predicted from an MP2/6-311+G(d,p) optimization, they concluded that the only observed isomer is that formed of the neutral isomer and water, 44a. Balabin examined the glycine-one water complex using IR spectroscopy. While he too found 44a, he was able to detect a small amount of 44b and 44c. An interesting side note is that anharmonic corrections were necessary in order to match up the computed (MP2) frequencies with the experimental values. These experiments indicate that more than one water molecule is needed to stabilize the zwitterion tautomer. 

Legon, A. C. and Willoughby, L. C., First-order Stark effect and electric dipole moment of HjP"HC N by pulsed-nozzle Fourier-transform microwave spectroscopy, Chem. Phys. Lett. 111,566-570(1984). 

CHIRPED-PULSE FOURIER TRANSFORM MICROWAVE SPECTROSCOPY A NEW TECHNIQUE FOR RAPID IDENTIFICATION OF CHEMICAL... 

Chirped-Pulse Fourier Transform Microwave Spectroscopy 291... 

G. G. Brown, B. C. Dian, K. O. Douglass, S. M. Geyer, B. H. Pate, The rotational spectrum of epifluorohydrin measured by chirped-pulse Fourier transform microwave spectroscopy, J. Mol. Spec. In Press, available online. 

The preceding, somewhat historical, review of spectroscopic structural methods is more-or-less complete up to the 1980s. Of course, many new experimental tools had appeared by this time and were leading to additional high-quality data, often with unprecedented precision. These included Fourier-transform microwave spectroscopy... 

In the excited state n the interaction of the radiation field with the molecule induces emission, and the molecule relaxes to the lower state m. The induced emission is indistinguishable from the field that caused it. Furthermore, it is of no use analytically unless the excitation source radiation is interrupted before the upper state population has had time to relax. That becomes the case in Pulsed Fourier Transform microwave spectroscopy where the excitation source is pulse modulated and the induced radiation is emitted against a very low microwave background. 

In order to obtain a precise structure the rotational spectra of 24 isotopomers were studied by molecular beam Fourier transform microwave spectroscopy. The isotopomers of the ethyrtylbenzene subunit are labelled according to... 

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