Surface Tamm States of 2-5 nm Nanodiamond via Raman Spectroscopy.

We observed resonance effects in the Raman scattering of nanodiamonds with an average size of 2-5 nm excited at a wavelength of 1064 nm (1.16 eV). The resonant Raman spectrum of the 2-5 nm nanodiamonds consists of bands at wavelengths of 1325 and 1600 cm, a band at 1100-1250 cm, and a plateau in the range from 1420 to 1630 cm.

UV Light Irradiation Effects in P-Doped Diamonds: Total Content Determination of Phosphorus Donors.

Upon the UV light irradiation of single-crystal diamonds doped with phosphorus, several effects have been observed. The integral intensity of phosphorus lines in FTIR absorption spectra under UV radiation was increased. A saturation effect depending on the power of the laser radiation was demonstrated.

Linear response of a superfluid Fermi gas inside its pair-breaking continuum.

We study the signatures of the collective modes of a superfluid Fermi gas in its linear response functions for the order-parameter and density fluctuations in the Random Phase Approximation (RPA). We show that a resonance associated to the Popov-Andrianov (or sometimes "Higgs") mode is visible inside the pair-breaking continuum at all values of the wavevector q, not only in the (order-parameter) modulus-modulus response function but also in the modulus-density and density-density responses. At nonzero temperature, the resonance survives in the presence of thermally broken pairs even until the vicinity of the critical temperature T, and coexists with both the Anderson-Bogoliubov modes at temperatures comparable to the gap Δ and with the low-velocity phononic mode predicted by RPA near T.

Overtone spectroscopy of v(C=O) stretching vibration of hexafluoroacetone: Experimental and ab initio determination of peak positions, absolute intensities, and band shapes.

Infrared overtone spectra of the ν(C = O) stretching vibration (ν) of gaseous hexafluoroacetone ((CF)C = O, HFA) were recorded in the spectral range of 7450-3300 cm with a resolution of 0.1 cm. Experimental absolute IR intensities and vibrational band centers of the overtones 2ν, 3ν, 4ν of HFA were measured and compared with their ab initio counterparts, calculated by the second-order canonical vibrational perturbation theory (CVPT2).

Data on vibrational spectra of the langasites LnCrGeBeO (Ln = La, Pr, Nd) and calculations.

In "Lattice dynamics and structure of the new langasites LnCrGeBeO (Ln = La, Pr, Nd): vibrational spectra and calculations" [1], experimental and calculated results on lattice dynamics of the recently discovered new compounds LaCrGeBeO, PrCrGeBeO, and NdCrGeBeO are reported. These compounds belong to the langasite series and constitute a new class of low-dimensional antiferromagnets. The data presented in this article includes IR diffuse transmission spectra of powder samples of LnCrGeBeO (Ln = La, Pr, Nd) registered at room temperature with a Bruker 125HR Fourier spectrometer, Raman spectra taken in the backscattering geometry (also at room temperature) with a triple monochromator using the line 514, 5 nm of an argon laser as an excitation, results of the DFT calculations with the B3LYP and PBE0 hybrid functionals on the optimized crystal structures, eigenfrequencies and eigenvectors of the normal vibrational modes.