High-frequency (optical) and low-frequency (static) dielectric constant versus band gap trends, as well as index of refraction versus band gap trends are plotted for 107 inorganic semiconductors and insulators. These plots are describable via power-law fitting. Dielectric screening trends that emerge from this analysis have important optical and electronic implications. For example, barrier low...

H3 plays a key role in interstellar chemistry as the initiator of ion–molecule chemistry. The amount of H3 observed in dense interstellar clouds is consistent with expectations, but the large abundance of H3 seen in diffuse clouds is not easily explained by simple chemical models. A crucial parameter in predicting the abundance of H3 in diffuse clouds is the rate constant for dissociative recom...

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Supercontinuum generation in air using tightly focused femtosecond laser pulses was investigated experimentally. Broadband white-light emission covering the whole visible spectral region was generated. Spectral broadening extended only to the blue side of the fundamental frequency due to the phase modulation induced by the strong ionization of air. Numerical simulation was also performed to con...

The theory of Frame transformation relations between the states of Born Oppenheimer and the weak coupling approximations is developed for polyatomic molecules. The symmetry relations are a generalization of the frame transformation relations derived by Harter and Crogman for coupled rotor molecules. A key internal symmetry label (named “soul”) is defined so that it remains a constant label for ...

The effect of pressure on acceptor levels and hole scattering mechanisms in p-GaSe is investigated through Hall effect and resistivity measurements under quasi-hydrostatic conditions up to 4 GPa. The pressure dependence of the hole concentration is interpreted through a carrier statistics equation with a single (nitrogen) or double (tin) acceptor whose ionization energies decrease under pressur...

1. The solubilities and differential heats of solution of d-tyrosine, dl-tyrosine, diiodo-dl-tyrosine, dibromo-l-tyrosine (hydrated), dibromo-l-tyrosine (anhydrous), and dichloro-l-tyrosine (hydrated) have been determined. 2. Evidence has been advanced that dl-tyrosine is a compound. 3. From the solubility determinations at various acidities, the apparent acid and basic dissociation constants o...

We present Keck spectropolarimetry of a rare “Iron LoBALQSO,” FIRST 0840+3633. The continuum is ∼4% polarized near 2000Å rest-frame, but falls to ∼2% at longer wavelengths, and maintains a relatively constant position angle of 50. The emission lines are unpolarized. The polarization increases up to ∼8% in the low-ionization absorption troughs of Mg II λ2800 and Al III λ1860. The polarization an...