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41.
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H. J. W. M. Hoekstra W. C. L. Hopman J. Kautz R. Dekker R. M. De Ridder 《Optical and Quantum Electronics》2006,38(9-11):799-813
The paper presents a simple coupled mode model to describe near band-edge phenomena in the spectral response of waveguides with a section containing a rectangular grating. It is shown that nearly all relevant parameters can be determined in reasonable approximation from only the dispersion curve and one adjustable, proportionality constant. The theory is compared with results from numerical calculations and experiments. 相似文献
43.
Alexander von Zastrow Rico Otto Sébastien Jézouin Jonathan Brox Martin Stei Olmo González-Magaña Geert Reitsma Thomas Schlathölter Ronnie Hoekstra Thorsten Best Roland Wester 《Applied physics. B, Lasers and optics》2014,114(1-2):251-255
Energetic impact of multiple ionized oxygen on protonated water clusters in the range of eight to twenty-one water molecules is investigated on the ZERNIKE--LEIF facility. The target water clusters are stored in a Paul trap and thermalized by cold buffer gas. This well-controlled approach allows for a direct measurement of the total inelastic cross section leading to trap-loss processes of the target ions. 相似文献
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Alvarado F Bari S Hoekstra R Schlathölter T 《Physical chemistry chemical physics : PCCP》2006,8(16):1922-1928
Recent experiments on low energy ion-induced damage to DNA building blocks indicate that ion induced DNA damage is dominated by deoxyribose disintegration (Phys. Rev. Lett., 2005, 95, 153201). We have studied interactions of keV H+ and He(q+) with isolated deoxyribose molecules by means of high resolution time-of-flight spectrometry. Extensive statistical fragmentation of the molecules is observed. The fragment distribution is found to follow a power law dependence. The exponent can be used to characterize and quantify the molecular damage. 相似文献
46.
Balistreri ML Klunder DJ Blom FC Driessen A Hoekstra HW Korterik JP Kuipers L van Hulst NF 《Optics letters》1999,24(24):1829-1831
Whispering gallery modes in cylindrical integrated optics microcavities have, for what is to our knowledge the first time, been mapped with a photon scanning tunneling microscope. Optical images were obtained with a spatial resolution of 50 nm. By combination of information on the spatial optical distributions with wavelength-dependent measurements, an unexpectedly rich variety of intracavity phenomena, such as polarization conversion and interference of copropagating and counterpropagating modes, could be directly observed. A quantitative comparison of the experimental data with computer simulations results in a comprehensive understanding of the various whispering gallery modes inside the microcavity. 相似文献
47.
本文报道于酸性水溶液中, 以单电流阶跃法, 单电位阶跃法, 计时电量法和循环伏安法测定了2,2,6,6-四甲基-4-羟基哌啶-1-氧自由基的扩散系数及其在碳糊和铂工作电极上的单电子氧化反应的传递系数. 以及该电极反应的标准速率常数. 相似文献
48.
化学反应中的双稳性的临界现象及Landau相变理论 总被引:4,自引:0,他引:4
本文通过两个典型事例,即Langmuir形式的交换过程和Schlogle用以模拟一级相变的自催化反应,阐明化学反应系统的双稳性临界现象同样可以纳入Landau相变理论的模式。从而进一步揭示了双稳系统一级相变线临界点的二级(连续)相变特征,同时也揭示了作为远离平衡的化学反应双稳性临界现象的共性,以至于在更大范围内临界现象的共性。将相变的Landau理论,由原来的处于热平衡的凝聚物质推广到范围更宽广,表现更为丰富多彩的远离平衡系统的临界现象。 相似文献
49.
L. Feenstra O.B. Hoekstra P.J.M. Peters W.J. Witteman 《Applied physics. B, Lasers and optics》2000,70(2):231-235
An X-ray preionised ArF and KrF excimer laser has been studied with three different spiker-sustainer excitation circuits.
We observed large differences in the laser performance, when the preionisation delay timing was varied on a nanosecond timescale.
The behaviour of both lasers was found to be equivalent. The observations can be understood by considering the effect of the
discharge excitation technique on the preionisation process. An excitation mode with a prepulse well above the steady-state
voltage VSS with a subsequent reversed overshoot voltage for initiating the discharge, in combination with a well-timed preionisation
pulse is found to give the best results. Optimum output energies of 50 mJ with ArF and 175 mJ with KrF were obtained from
an active volume of 60×1.5×1.2 cm in the so-called swing mode, with the preionisation applied 60 ns before the discharge breakdown.
Received: 23 February 1999 / Revised version: 4 June 1999 / Published online: 16 September 1999 相似文献
50.