The light emission from a scanning tunneling microscope operated on a Ag(111) surface at 6 K is analyzed from low conductances to values approaching the conductance quantum. Optical spectra recorded at sample voltages V reveal emission with photon energies hν>2eV. A model of electrons interacting coherently via a localized plasmon-polariton mode reproduces the experimental data, in particular, ...

208 Pb induced reactions at the CERN SPS are presented. Inclusive photon spectra down to a transverse momentum of 30 MeV/c measured with leadglass spectrometer LEDA of the WA98 experiment are compared to the VENUS Monte-Carlo model. The inverse slope of 0 spectra is studied as a function of the centrality of the reaction. A saturation of the extracted slope parameter for semi-central and centra...

Small-angle scattering due to mirror surface roughness is shown to couple the optical modes and deform the transmission spectra in a frequency-degenerate optical cavity. A simple model based on a random scattering matrix clearly visualizes the mixing and avoided crossings between multiple transverse modes. These effects are visible only in the frequency-domain spectra; cavity ringdown experimen...

We have determined action spectra for transformation of human embryonic skin and muscle fibroblasts to anchorage-independent growth. Tests under our experimental conditions indicate that reciprocity holds for photon rate and exposure time and that all the dose-effect curves in the wavelength range of 248 to 297 nm are smaller. These data can be used to construct action spectra with a maximum at...

We calculate thermal photon and neutral pion spectra in ultrarel-ativistic heavy-ion collisions in the framework of three-fluid hydrody-namics. Both spectra are quite sensitive to the equation of state used. In particular, within our model, recent data for S + Au at 200 AGeV can only be understood if a scenario with a phase transition (possibly to a quark-gluon plasma) is assumed. Results for A...

A photon-tissue interaction (PTI) model was developed and employed to analyze 96 pairs of reflectance and fluorescence spectra from freshly excised human pancreatic tissues. For each pair of spectra, the PTI model extracted a cellular nuclear size parameter from the measured reflectance, and the relative contributions of extracellular and intracellular fluorophores to the intrinsic fluorescence...

Articles you may be interested in Assessment of mode-mixing and Herzberg-Teller effects on two-photon absorption and resonance hyper-Raman spectra from a time-dependent approach Electronic polarization effect on low-frequency infrared and Raman spectra of aprotic solvent: Molecular dynamics simulation study with charge response kernel by second order Møller–Plesset perturbation method The forma...

Recently the first single photon spectra from CERN energy heavy-ion collisions were reported by WA80, while NA34/3 and NA38 have obtained the spectra for dileptons with the mass up to 4-5 GeV. The production rates for photons and dileptons significantly increase when reactions involving the A 1 meson are included. However, with the conventional expansion scenario, the absolute yields are still ...

A review is presented on recent developments in ultra-soft x-ray emission spectroscopy. Especially, instrumental developments related to high resolution studies of free molecules and to the use of synchrotron radiation are discussed. The most recent results from three different applications of ultra-soft x-ray emission spectroscopy are presented: electron excited spectra of free molecules, mono...