中国科学院机构知识库网格系统: 检索

No pulsed radio emission during a bursting phase of a Galactic magnetar 期刊论文 OAI收割
Nature, 2020, 卷号: 587, 页码: 63-65
作者: HXMT

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收藏 | 浏览/下载：44/0 | 提交时间：2022/02/08

Astrophysics - High Energy Astrophysical Phenomena Abstract: Fast radio bursts (FRBs) are millisecond-duration radio transients of unknown physical origin observed at extragalactic distances^1-3. It has long been speculated that magnetars are the engine powering repeating bursts from FRB sources^4-13, but no convincing evidence has been collected so far¹⁴. Recently, the Galactic magnetar SRG 1935+2154 entered an active phase by emitting intense soft íray bursts¹⁵. One FRB-like event with two peaks (FRB 200428) and a luminosity slightly lower than the faintest extragalactic FRBs was detected from the source, in association with a soft íray/hard-X-ray flare^18-21. Here we report an eight-hour targeted radio observational campaign comprising four sessions and assisted by multi-wavelength (optical and hard-X-ray) data. During the third session, 29 soft-íray repeater (SGR) bursts were detected in íray energies. Throughout the observing period, we detected no single dispersed pulsed emission coincident with the arrivals of SGR bursts, but unfortunately we were not observing when the FRB was detected. The non-detection places a fluence upper limit that is eight orders of magnitude lower than the fluence of FRB 200428. Our results suggest that FRB-SGR burst associations are rare. FRBs may be highly relativistic and geometrically beamed, or FRB-like events associated with SGR bursts may have narrow spectra and characteristic frequencies outside the observed band. It is also possible that the physical conditions required to achieve coherent radiation in SGR bursts are difficult to satisfy, and that only under extreme conditions could an FRB be associated with an SGR burst.

Microscopic View of Defect Evolution in Thermal Treated AlGaInAs Quantum Well Revealed by Spatially Resolved Cathodoluminescence 期刊论文 OAI收割
Materials, 2018, 卷号: 11, 期号: 6, 页码: 11
作者: Song, Y.; Zhang, L. G.; Zeng, Y. G.; Qin, L.; Zhou, Y. L.

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收藏 | 浏览/下载：14/0 | 提交时间：2019/09/17

AlGaInAs quantum well metal organic chemical vapor deposition cathodeluminescence thermal treatment segregation lasers inp semiconductors dislocations ingaalas epitaxy origin band Materials Science

Photoluminescence spectroscopy and positron annihilation spectroscopy probe of alloying and annealing effects in nonpolar m-plane ZnMgO thin films 期刊论文 OAI收割
applied physics letters, 2010, 卷号: 96, 期号: 15, 页码: art. no. 151904
作者: Jin P; Wei HY; Song HP

收藏 | 浏览/下载：194/32 | 提交时间：2010/05/04

alloying annealing electrical conductivity excitons II-VI semiconductors magnesium compounds MOCVD coatings photoluminescence positron annihilation semiconductor thin films vacancies (crystal) wide band gap semiconductors zinc compounds SEMICONDUCTORS EMISSION ORIGIN DIODES

Resonance enhanced multiphoton ionization spectroscopy and theoretical calculations of cis and trans p-methoxystyrene rotamers 期刊论文 OAI收割
JOURNAL OF MOLECULAR STRUCTURE, 2009, 卷号: 918, 期号: 1-3, 页码: 154-159
作者: Xiao, Daoqing; Yu, Dan; Xu, Ming; Yu, Zijun; Du, Yikui

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收藏 | 浏览/下载：21/0 | 提交时间：2019/04/09

P-methoxystyrene Rotamer Band Origin R2pi

Resonance enhanced multiphoton ionization spectroscopy and theoretical calculations of cis and trans p-methoxystyrene rotamers 期刊论文 OAI收割
journal of molecular structure, 2009, 卷号: 918, 期号: 1-3, 页码: 154-159
作者: Xiao, Daoqing; Yu, Dan; Xu, Ming; Yu, Zijun; Du, Yikui

收藏 | 浏览/下载：35/0 | 提交时间：2015/11/12

p-Methoxystyrene Rotamer Band origin R2PI

Vibrational spectrum of p-fluoroanisole in the first excited state (S-1) and ab initio calculations 期刊论文 OAI收割
JOURNAL OF MOLECULAR STRUCTURE, 2008, 卷号: 882, 期号: 1-3, 页码: 56-62
作者: Xiao, Daoqing; Yu, Dan; Xu, Xiling; Yu, Zijun; Du, Yikui

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收藏 | 浏览/下载：25/0 | 提交时间：2019/04/09

P-fluoroanisole Band Origin R2pi Zero Point Level (Zpl) Energy Ab Initio

Vibrational spectrum of p-fluoroanisole in the first excited state (S-1) and ab initio calculations 期刊论文 OAI收割
journal of molecular structure, 2008, 卷号: 882, 期号: 1-3, 页码: 56-62
作者: Xiao, Daoqing; Yu, Dan; Xu, Xiling; Yu, Zijun; Du, Yikui

收藏 | 浏览/下载：30/0 | 提交时间：2015/11/11

p-fluoroanisole band origin R2PI zero point level (ZPL) energy ab initio

Vibrational spectra and theoretical calculations of p-chlorophenol in the electronically excited S-1 and ionic ground D-0 states 期刊论文 OAI收割
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 2008, 卷号: 193, 期号: 2-3, 页码: 245-253
作者: Huang, Jianhan; Huang, Kelong; Liu, Suqin; Luo, Qiong; Tzeng, Wenbih

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收藏 | 浏览/下载：26/0 | 提交时间：2019/04/09

1c-r2pi 2c-r2pi Mati Band Origin Ie Isotope Effect

Vibrational spectra and theoretical calculations of p-chlorophenol in the electronically excited S-1 and ionic ground D-0 states 期刊论文 OAI收割
journal of photochemistry and photobiology a-chemistry, 2008, 卷号: 193, 期号: 2-3, 页码: 245-253
作者: Huang, Jianhan; Huang, Kelong; Liu, Suqin; Luo, Qiong; Tzeng, Wenbih

收藏 | 浏览/下载：22/0 | 提交时间：2015/11/12

1C-R2PI 2C-R2PI MATI band origin IE isotope effect

Molecular structures and vibrations of cis and trans m-cresol in the electronically excited S-1 and cationic D-0 states 期刊论文 OAI收割
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 2007, 卷号: 188, 期号: 2-3, 页码: 252-259
作者: Huang, Jianhan; Huang, Kelong; Liu, Suqin; Luo, Qiong; Tzeng, Wenbih

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收藏 | 浏览/下载：19/0 | 提交时间：2019/04/09

Two Color Resonant Two Photon Ionization (2c-r2pi) Mass Analyzed Threshold Ionization (Mati) Band Origin Ionization Energy (Ie) Ab Initio Density Functional Theory (Dft)