für Naturforschung in cooperation with the Max Planck Society for the Advancement of Science under a Creative Commons Attribution 4.0 International License. Dieses Werk wurde im Jahr 2013 vom Verlag Zeitschrift für Naturforschung in Zusammenarbeit mit der Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. digitalisiert und unter folgender Lizenz veröffentlicht: Creative Commons Namen...

The availability of commercial 325 MHz, 2.5 MW klystrons initiated the development of linac resonators which fit to that power level source: this will lead to a significant overall linac cost reduction. This is achieved if individual cavity modules can be rf coupled efficiently. At IAP Frankfurt a coupling cell for CH – cavity modules was designed, which at the same time can house a transverse ...

The nuclear spins of ionized donors in silicon have become an interesting quantum resource due to their very long coherence times. Their perfect isolation, however, comes at a price, since the absence of the donor electron makes the nuclear spin difficult to control. We demonstrate that the quadrupolar interaction allows us to effectively tune the nuclear magnetic resonance of ionized arsenic d...

With conventional NMR of polycrystalline solids, broad and often featureless spectra are frequently obtained and the effects of some molecular motions are not readily observed. 1 The resolution and sensitivity of nuclear quadrupole resonance (NQR) and broadline NMR is often so low that only the rigid and rapid motional regimes can be studied. In the intermediate region, where the exchange rate ...

The NQR-spectrum of 127I in orthoperiodic acid, H 5 I0 6 , has been studied on powder samples in the temperature range 77 K T 398 K. The resonance frequencies vx of the transition i n ( ± 3 / 2 ) ^ m ( ± l / 2 ) are 45.248 + 0.005 MHz (77 K) and 4 4 . 9 7 6 ± 0 . 0 0 5 MHz (296 K ) . For the transition TO(±5/2) ^ I t o ( ± 3 / 2 ) the resonance frequencies v2 are 8 3 . 4 7 8 ± 0 . 0 0 5 MHz (77...

*Correspondence: M. R. Tarbutt, Blackett Laboratory, Centre for Cold Matter, Imperial College London, Prince Consort Road, London SW72AZ, UK e-mail: [email protected] The simple structure of the BH molecule makes it an excellent candidate for direct laser cooling. We measure the branching ratios for the decay of the A1 (v ′ = 0) state to vibrational levels of the ground state, X1 +, and ...

The deuteron, N N analyzing powers A y , and the singlet scattering length show great sensitivity to the πN N coupling constant g π. While the pp A y data favor g 2 π /4π ≤ 13.6, the np A y data and the deuteron quadrupole moment imply g 2 π /4π ≥ 14.0. The two diverging values could be reconciled by the assumption of (substantial) charge-splitting of g π. However, the established theoretical e...

35Cl NMR spectra were measured using the highest-temperature solid phase of n-CxH(2x+1) NH3Cl and n-CxH(2x+1)ND3Cl (x= 5−10). The observed quadrupole coupling constants (e2Qqh−1) decreased upon heating in this phase, and significant frequency differences of ca. 20 – 30 kHz were detected between the -NH3 and -ND3 analogs. In the low-temperature range of this phase, the observed e2Qqh−1 values fo...

A pulsed jet cavity Fourier transform microwave spectrometer has been used to measure the rotational spectra of OCCuX (X = F, Cl, Br) in the frequency range 5-21 GHz. Metal atoms were generated via laser ablation and were allowed to react with CO and a halide precursor, prior to stabilization of the products within a supersonic jet. These are the first experimental observations of OCCuF and OCC...