Resonant cars spectroscopy of s-tetrazine vapour

CARS experiments on s-tetrazine vapour show that the electronic resonance enhancement in the Q-branch is most effective for the lower J values. This suggests that the radiationless relaxation rate in the excited state increases with rotational quantum number. Delayed picosecond CARS experiments indicate that the rotation-vibration coupling for the 1008 cm^?1 ground-state vibrational mode is approximately 2 MHz.     

Enhanced raman scattering from carbon layers on silver

The broad bands at 1350 and 1550 cm^?1 observed in Raman scattering from Ag in electrochemical cells have been observed on Ag surfaces in tunneling structures and in ultrahigh vacuum. Both the shape and intensity of this scattering is explained by the presence of amorphous carbon on the Ag surfaces.     

Electronic energy transfer to metal surfaces: a test of classical image dipole theory at short distances

Electronic energy transfer from molecules to metal surfaces at distances < 50 Å has been measured. A monolayer of luminescent molecules is separated from a single crystal metal surface by a layer of physisorbed Ar. The luminescence quantum yield is measured as a function of the Ar spacer thickness. A cubic distance dependence is observed, in agreement with classical image dipole theory.     

Determination of the lifetime of the mercury 63P1 state

A pulsed tunable dye laser was used for a high resolution experimental study of mercury fluorescence from the 6³P₁ state. The output of the dye laser was frequency doubled into the 253.7 nm region using a potassium penta-borate crystal. Exponential decays were observed for each of the five individual components of the hyperfine structure separately and the effects of the trapping of resonance radiation on the observed lifetime of the 6³P₁ state of mercury were investigated for each resolvable component. Within experimental error, the natural radiative lifetime of the 6³P₁ state was found to be independent of the hyperfine component irradiated and a value of 122±2 nsec was obtained, consistent with results found by other methods.     

Variational principles for scattering in the generator coordinate method

The generator coordinate method (GCM) wave function is used as a trial function in a Kohn type variational principle for scattering phase shifts. It is shown that a GCM trial function is a solution of the variational equations if the Hill-Wheeler integral equation is satisfied subject to an appropriate boundary condition. A new method for introducing the scattering boundary condition is presented. There is a uniqueness theorem for the phase shift.     

Perturbation theory for projected states in the pairing force model: (III). The problem of spurious states

We discuss the possible types of behaviour of spurious states within the framework of the perturbation theory for projected states. The two-level nuclear pairing force model is used to test them.     

Saturation of optical absorption in InSb

Saturation of optical absorption in InSb has been observed by using near absorption edge wavelenght radiation of subnanosecond duration at 5.3μm to affect a wavelenght dependence on the optical absorption edge. A nearly three orders of magnitude self-induced enhancement of transparency has been measured for optical energy transmission through the absorption medium. The residual absorption losses are anomalously low.     

Evaluation of Automated ECG Monitoring: Theoretical Model Based upon Point Process Techniques

The development of practical methods of ECG monitoring using dedicated computers has presented problems in the evaluation and comparison of the relative effectiveness of various ECG monitoring systems. A theoretical model based on the application of point process techniques is discussed in this paper.     

Nuclear magnetic resonance and static magnetic susceptibility of AsF5 - intercalated graphite

NMR and static magnetic susceptibility (χ) measurements on stage 1 AsF₅ intercalated graphite (C₈AsF₅) are presented. The relaxation times, T_i and T₂, of the F¹⁹ nuclear magnetic resonance were measured over the temperature range 136K – 295K; χ was measured over the range 80K – 295K. The NMR results indicate a motionally narrowed line with gradual ordering of the intercalant as the temperature is decreased. The magnetic susceptibility is independent of temperature with no observable Curie law controbution. The absence of localized moment behavior for the intercalant is interpreted either in terms of chemical disproportionation of the AsF₅ to closed shell ions or in terms of the Anderson model of localized moments in metals.