Overshoot inversion of a Nd laser system

An important parameter of pulsed solid state lasers is the maximum inversion n_max which has to exceed the threshold inversion n_th to start the laser. The overshoot Δn=n_max-n_th is determined experimentally for a Nd-glass laser, operating in the TEM₀₀ mode and compared with theoretical predictions. Both investigations indicate a relation between normalized pump rate and inversion overshoot of the type Δn ∝ (W/W_th-1)^{$\text{1}\text{2}$}.     

Untersuchungen des spektralen Ausbleichens von S?ttigungsabsorbern

Ohne ZusammenfassungSiehe ausführliche Publikation Z. angew. Math. Phys.22, 458 (1971).     

Phosphorylations with ROP(X)C12: A New Mechanistic Pathway

Abstract

Me/P(X)C1₂ (X,Y = O,S) reacts with equimolar as well as with excess amounts of pyridine below room temperature to form pyridinium betaines which act as strong bifunctional phosphorylating agents, Isolation of quite stable crystalline betaines can be accomplished by using 4-dimethylaminopyridine. The concept of donor-mediated phosphorylation is also applioable to monofunctional systems and oan even be made more convenient by in situ generation of the reagents.     

Resonance Raman spectrum of the transient (SCN)−2 free radical anion

The resonance Raman spectrum of the transient species (λ_max = 475 nm, τ_{$\text{1}\text{2}$} = 1.6 μs) formed by pulse radiolysis of aqueous solutions of thiocyanate, SCN^2?, is reported. The spectrum is discussed in terms of the previous assignment of this transient to the radical anion, (SCN)^?₂. The observed vibrational frequencies of the radical anion are consistent with substantial weakening of the SS and the CN bonds are compared with neutral thiocyanogen.     

Spectral measurement of the Hall angle response in normal state cuprate superconductors

We measure the temperature and frequency dependence of the complex Hall angle for normal state YBa(2)Cu(3)O(7) films from dc to far-infrared frequencies (20-250 cm(-1)) using a new modulated polarization technique. We determine that the functional dependence of the Hall angle on scattering does not fit the expected Lorentzian response. We find spectral evidence supporting models of the Hall effect where the scattering Gamma(H) is linear in T, suggesting that a single relaxation rate, linear in temperature, governs transport in the cuprates.