稀薄氣體玻仕-愛因斯坦凝結之研究(II)

Xiaotian Wang

Osamu Karatsu, Iwao Ogura

The intensity changes of all the important spontaneous emissions of Kr I and Kr II in visible region are examined, when the 5682Å laser transition (5p 4 D 5/2 →5s 2 P 3/2 ) in Kr II is interrupted by a rotating chopper. The strong positive cross-modulations are observed in the lines which start from 5p 4 D 5/2 state of Kr II. The cross-modulations of the lines which end on 5 s 2 P 3/2 state of Kr II are not so strong. But certain degree of cross-modulations are observed in some of the lines of Kr II which have no direct connection to the laser states. No cross-modulation is observed in the Kr I lines.

B. E. Cole, E. B. Saloman, D. L. Ederer

The first reported study of a fluorescence spectrum of a metal vapor resonantly excited by vacuum-ultraviolet radiation has been made in Ba ii. Seven Ba ii fluorescent transitions have been identified for Ba vapor excited by 584-Å radiation. The intensities of these transitions are consistent with the population distribution of excited Ba ii observed by using photoelectron spectroscopy. No detectable Ba ii fluorescence was observed when 736–742-Å excitation was used.

桂起权

Bucha., 何常

C. LIN, Yong Li, Qingqing Zhang +1 more

An anonymous identity based encryption (anonymous IBE) scheme requires that an adversary can not determine the identity of the recipient from a ciphertext encrypted by the corresponding public key. The anonymity was formalized in previous works [1], [13], and this can be considered under chosen plaintext attack and adaptive chosen ciphertext attack, yielding two notions of security, ID-II-CPA and ID-II-CCA, where II denotes “indistinguishability of identities.” However, how to obtain an ID-II-CCA secure anonymous IBE in the random oracle model is still a challenging problem. We firstly propose a new notion of plaintext awareness in the two identities setting, called PATI. Secondly, we prove that the IBE scheme is ID-II-CCA secure if it is PATI secure. Finally, we propose the first generic conversion for anonymous IBE from ID-II-CPA to ID-II-CCA in the random oracle model.