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double-excited resonant structure of photoionization

Science China Mathematics 1997年第7期40卷 738-744页

作者：刘锦超杨向东王宗笠程延松 Institute of Physics Sichuan Union UniversityChengdu 610065China Department of Physics University of VirginiaChariottesvilleVA 22901USA Department of Physios Chongqing UniversityChongqing 630044China

The dominant diagrams were found in double-excited resonant structure of photoionization by using many-body perturbation *** on the characteristics of these diagrams,the couple-equation method was improved,and the summation of specific classes of these diagrams is to an infinite order,and the resonant peaks with the widths are obtained *** doubled-excited resonant structures (2p,3s)→(3p,np),(3p,nf),(3d,nd),(3d,ns) and (4s,ns) of the photoionization processes 2p→ks,kd are *** photoionization with excitation process (2p,3s)→(3p,kp) was included in the *** results of calculations are compared with the experimental data from 38.5 to 46.8 eV photon energies,which are in good agreement with the experiment.

关键词： double-excited resonance photoionization many-body perturbation.

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ANALYSIS OF double-excited PIEZOELECTRIC TONPILZ TRANSDUCER

ANALYSIS OF DOUBLE-EXCITED PIEZOELECTRIC TONPILZ TRANSDUCER

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2013全国压电和声波理论及器件技术研讨会

作者： Zhi-qiang LI Xi-ping MO Ying-ming LI Yao-zong PAN Institute of Acoustics Chinese Academy of Sciences University of Chinese Academy of Sciences

The piezoelectric Tonpilz transducer has many obvious advantages,such as simple structure,high electro-acoustic transforming efficiency,and high transmitting *** usefulness is limited because of its high mechanical quality factor *** of Tonpilz type with double excitations has been invented to broaden the operating frequency band by stimulating two adjacent longitudinal vibration ***,the peak and valley level of transmitting voltage response（TVR）was hard to be less than 3dB without matching *** of the added mass in the pzt-4 ceramics helps get near the first two longitudinal resonant modes,while the length and radiating area of head plate influence the bending modes and radiation quality ***-excited tonpilz transducers which combine the first two longitudinal modes and bending modes were designed with the help of finite element *** stimulating no less than 3 vibration modes,the-3dB operating bandwidth was much broader than ever before,what’s more,the performance achieved without the help of matching layers.

关键词： double-excited Mid-mass Broadband

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