Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504)最新文献

Manipulation of soliton ensembles by spectral filtering 光谱滤波对孤子系综的操纵

Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504) Pub Date : 2002-08-06 DOI: 10.1109/IQEC.2000.907865

S. Rutz, T. Korosi, F. Mitschke

引用次数: 1

Quantum transport of atoms in optical lattices 光学晶格中原子的量子输运

Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504) Pub Date : 2000-10-01 DOI: 10.1109/IQEC.2000.923943

M. Raizen

引用次数: 4

Biexcitons or bipolaritons in a semiconductor microcavity? 半导体微腔中的双激子还是双极化子?

Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504) Pub Date : 2000-09-15 DOI: 10.1109/IQEC.2000.908167

P. Borri, W. Langbein, U. Woggon, J. R. Jensen, J. Hvam

引用次数: 26

Photoassociation of cold Ca atoms 冷Ca原子的光缔合

Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504) Pub Date : 2000-09-11 DOI: 10.1109/IQEC.2000.907787

G. Zinner, T. Binnewies, F. Riehle, E. Tiemann

{"title":"Photoassociation of cold Ca atoms","authors":"G. Zinner, T. Binnewies, F. Riehle, E. Tiemann","doi":"10.1109/IQEC.2000.907787","DOIUrl":"https://doi.org/10.1109/IQEC.2000.907787","url":null,"abstract":"Photoassociative spectroscopy using laser cooled atoms proved to be a powerful tool for the determination of atomic properties such as excited state lifetimes and ground state scattering lengths. The most abundant isotopes of alkaline earths show a non-degenerate ground state with no hyperfine splitting, which is expected to simplify their photoassociation spectra to a great extent. This advantage in the theoretical description is paid for by difficulties in the experimental observation of photoassociation. The ensembles of laser cooled alkaline earths are less cold and less dense than those of e.g. alkalines which were used in most of the photoassociation experiments until now. Photoassociation of Ca is achieved by exciting atomic pairs to the B/sup 1//spl Sigma//sub n//sup +/ excited state of Ca corresponding to an atomic pair 4s/sup 2/ /sup 1/S/sub 0/+4s4p /sup 1/P/sub 1/ at large nuclear distances R. The dimer is bound by the resonant dipole interaction. Due to acceleration in this R/sup -3/-potential, atoms decaying at a smaller nuclear distance usually have sufficient kinetic energy to leave the magneto-optical trap. By measuring the trap loss dependent on the frequency of a photoassociation laser red-detuned to the /sup 1/S/sub 0/-/sup 1/P/sub 1/ transition we resolved the vibrational and rotational structure of the molecule. From the positions of the observed vibrational levels, corrected for the partially unresolved rotational structure and the thermal energy distribution of the ground state atoms, the atomic radiation decay rate /spl gamma/=2.180(11)/spl middot/10/sup 8/ s/sup -1/ of level 4s4p /sup 1/P/sub 1/ is derived with an uncertainty reduced by nearly one order of magnitude compared to previous measurements.","PeriodicalId":267372,"journal":{"name":"Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504)","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130528135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 85

Vibrational wave packets in metal nanoparticles 金属纳米颗粒中的振动波包

Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504) Pub Date : 2000-09-10 DOI: 10.1109/IQEC.2000.907854

S. Grésillon, G. von Plessen, J. Feldmann, J. Porstendorfer, K. Berg, G. Berg

引用次数: 0

Low-threshold spatial solitons and instabilities in optical parametric oscillators 光参量振荡器中的低阈值空间孤子和不稳定性

Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504) Pub Date : 2000-09-10 DOI: 10.1109/IQEC.2000.907827

G. Oppo, A. Scroggie, S. Sinclair, I. Rabbiosi, M. Brambilla

引用次数: 0

Phase relations, quasi-continuous spectra and sub-fs pulses in stimulated Raman scattering 受激拉曼散射中的相位关系、准连续光谱和亚fs脉冲

Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504) Pub Date : 2000-09-10 DOI: 10.1109/IQEC.2000.908143

V. Kalosha, J. Herrmann

引用次数: 0

157, 193 and 248 nm structural damage of the DNA and RNA bases 157、193和248 nm的DNA和RNA碱基结构损伤

Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504) Pub Date : 2000-09-10 DOI: 10.1109/IQEC.2000.908055

E. Sarantopoulou, A. Cefalas

{"title":"157, 193 and 248 nm structural damage of the DNA and RNA bases","authors":"E. Sarantopoulou, A. Cefalas","doi":"10.1109/IQEC.2000.908055","DOIUrl":"https://doi.org/10.1109/IQEC.2000.908055","url":null,"abstract":"Dissociation dynamics of the RNA and DNA bases, thymine, cytosine, adenine and guanine with VUV and ultraviolet UV radiation, is of particular interest due to the availability of excimer lasers. The value of the absorption coefficient of the four bases in the UV is of the order of 104 cm/sup -1/ and therefore the one photon absorption probability is very high. At these wavelengths the complete breaking of the chemical bonds of the bases is taking place. The parent molecules disintegrate to small photofragments, atomic, diatomic or triatomic, which are flying apart with supersonic speed. We report on the the mass spectroscopic characteristics of DNA and RNA bases at 157, 193 and 248 nm, using pulsed discharge lasers. The studies reveal that even at low laser energy of 0.5 mJ and energy fluence of 0.2 mJ/cm/sup 2/, there is a complete breaking of the chemical bonds at these wavelengths. For 157 and 193 nm only photofragments with the ratio of m/e lower than 30 amu were observed. The molecular photofragments from the photodissociation of the parent monomer were observed mainly between 20 and 30 amu. Photofragments with two carbon and nitrogen atoms have a relatively higher probability to be dissociated from the parent monomer, than heavier photofragments with four carbon atoms. The DNA and RNA bases dissociate into fragments with the predominant mass at 28 amu for both laser wavelengths. This is a rather common response for molecules having the amide group. Therefore the amide group is mainly involved in the photodissociation process at least for wavelengths shorter than 248 nm.","PeriodicalId":267372,"journal":{"name":"Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504)","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127542666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stable bounded autosoliton states in a laser with a saturable absorber 具有饱和吸收体的激光器中的稳定有界自孤子态

Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504) Pub Date : 2000-09-10 DOI: 10.1109/IQEC.2000.908009

A. Vladimirov, G. Khodova, N. Rosanov

引用次数: 0

Generation of temporal dissipative structures in a continuous-wave pumped passive nonlinear optical fiber ring cavity 连续波泵浦无源非线性光纤环形腔中时间耗散结构的产生

Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504) Pub Date : 2000-09-10 DOI: 10.1109/IQEC.2000.907861

S. Coen, M. Haelterman

引用次数: 0