The reaction of phenyldimethylsilyllithium with N-phenylpyrrolidone

Phenyldimethylsilyllithium reacts with N-phenylpyrrolidone 5 to give the known tetracyclic amines [2,3,3a,3b,4,5,6,11b-octahydro-3aalpha,3balpha, 11balpha-1-phenyl-1H-dipyrrolo(1,2a:3',2'c)quinoline and its 3bbeta isomer] 6 and 7.     

High-quality-factor Bragg onion resonators with omnidirectional reflector cladding

We propose to approximate a spherically symmetric Bragg resonator in an onionlike geometry. We develop a transfer-matrix theory for calculation of the quality factors and analyze the effect of the onion stem on cavity Q factors. We find that it is possible to achieve significant inhibition of spontaneous emission in an onion resonator with omnidirectional cladding layers.     

Why ALC μSR is superior for gas‐phase radical spectroscopy

ALC μSR spectra of the muonated ethyl and cyclohexadienyl radicals in the gas phase are reported. They have surprisingly narrow lines for a magnetic resonance type technique under conditions near ambient temperature and near 1 atmosphere pressure. The main reason for this behaviour is the dramatic reduction of electron spin relaxation in high magnetic fields. This revised version was published online in August 2006 with corrections to the Cover Date.     

Search for a sliding charge density wave in layered compounds

Non-linear voltage-current behavior is observed in the quasi one dimensional compound NbSe₃, due to the contribution of a sliding Charge Density Wave (CDW) to the conductivity. We have looked for a non-linear voltage-current characteristics in the incommensurate CDW state of the layered compounds 2H-TaSe₂ and 1T-TaS₂ and find no evidence for such up to $\text{1.0V}\text{cm}$ and $\text{10V}\text{cm}$, respectively. These values are several orders of magnitude higher than the minimum depinning field observed in NbSe₃.     

Theory of the time development of the stokes shift in polar media

We present a theory for the time evolution of the Stokes shift of a polar molecule in a polar solvent. The time-dependent solute—solvent interaction is calculated in a continuum model by replacing the surrounding solvent by a frequency-dependent dielectric continuum. An expression for the time dependence of the fluorescence maximum is derived. This expression can be considered a direct generalization of the well-known Ooshika—Lippert—Mataga equation to the time domain. We also present an approximate expression for the wavelength dependence of the dynamics of the Stokes shift, and find it to be consistent with recent experimental results. We have investigated the effect of polarizability of the solute molecule and found that for many molecules this effect is not negligible.