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Collision integrals of electronically excited atoms in air plasmas. I. N-N and O-O interactions 期刊论文 OAI收割
PLASMA SOURCES SCIENCE & TECHNOLOGY, 2023, 卷号: 32, 期号: 12, 页码: 28
作者: Zhao, Wensheng; Hong, Qizhen; Yang, Chao; Sun, Quanhua; Hu, Yuan

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收藏 | 浏览/下载：19/0 | 提交时间：2024/01/02

collision integrals potential energy curves air plasmas N-N and O-O interactions electronic excitation

Do the observational data favor a local void? 期刊论文 OAI收割
PHYSICAL REVIEW D, 2021, 卷号: 103, 期号: 12, 页码: 123539
作者: Cai, Rong-Gen; Ding, Jia-Feng

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收藏 | 浏览/下载：29/0 | 提交时间：2021/09/27

HUBBLE-SPACE-TELESCOPE DARK-ENERGY CONSTRAINTS PHOTOMETRY DATA RELEASE LIGHT CURVES COSMOLOGICAL CONSTRAINTS SYSTEMATIC UNCERTAINTIES CEPHEID STANDARDS SUPERNOVA SURVEY IA SUPERNOVAE PAN-STARRS1

Detection of Flare Multiperiodic Pulsations in Mid-ultraviolet Balmer Continuum, Lyl Hard X-Ray, and Radio Emissions Simultaneously 期刊论文 OAI收割
The Astrophysical Journal, 2021, 卷号: 921, 页码: 179
作者: HXMT

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收藏 | 浏览/下载：27/0 | 提交时间：2022/02/08

Solar flares Solar oscillations Solar ultraviolet emission Solar x-ray emission Solar radio emission 1496 1515 1533 1536 1522 Astrophysics - Solar and Stellar Astrophysics Abstract: Quasi-periodic pulsations (QPPs), which usually appear as temporal pulsations of the total flux, are frequently detected in the light curves of solar/stellar flares. In this study, we present the investigation of nonstationary QPPs with multiple periods during the impulsive phase of a powerful flare on 2017 September 6, which were simultaneously measured by the Hard X-ray Modulation Telescope (Insight-HXMT), as well as the ground-based BLENSW. The multiple periods, detected by applying a wavelet transform and Lomb-Scargle periodogram to the detrended light curves, are found to be ~20-55 s in the Ly`and mid-ultraviolet Balmer continuum emissions during the flare impulsive phase. Similar QPPs with multiple periods are also found in the hard X-ray emission and low-frequency radio emission. Our observations suggest that the flare QPPs could be related to nonthermal electrons accelerated by the repeated energy release process, i.e., triggering of repetitive magnetic reconnection, while the multiple periods might be modulated by the sausage oscillation of hot plasma loops. For the multiperiodic pulsations, other generation mechanisms could not be completely ruled out.

An underlying clock in the extreme flip-flop state transitions of the black hole transient Swift J1658.2-4242 期刊论文 OAI收割
Astronomy and Astrophysics, 2020, 卷号: 641, 页码: A101
作者: HXMT

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收藏 | 浏览/下载：60/0 | 提交时间：2022/02/08

accretion accretion disks black hole physics X-rays: binaries time Astrophysics - High Energy Astrophysical Phenomena Abstract:
Aims: Flip-flops are top-hat-like X-ray flux variations, which have been observed in some transient accreting black hole binary systems, and feature simultaneous changes in the spectral hardness and the power density spectrum (PDS). They occur at a crucial time in the evolution of these systems, when the accretion disc emission starts to dominate over coronal emission. Flip-flops remain a poorly understood phenomenon, so we aim to thoroughly investigate them in a system featuring several such transitions.
Methods: Within the multitude of observations of Swift J1658.2-4242 during its outburst in early 2018, we detected 15 flip-flops, enabling a detailed analysis of their individual properties and the differences between them. We present observations by XMM-Newton, NuSTAR, Astrosat, Swift, Insight-HXMT, INTEGRAL, and ATCA. We analysed their light curves, searched for periodicities, computed their PDSs, and fitted their X-ray spectra, to investigate the source behaviour during flip-flop transitions and how the interval featuring flip-flops differs from the rest of the outburst.
Results: The flip-flops of Swift J1658.2-4242 are of an extreme variety, exhibiting flux differences of up to 77% within 100 s, which is much larger than what has been seen previously. We observed radical changes in the PDS simultaneous with the sharp flux variations, featuring transitions between the quasi-periodic oscillation types C and A, which have never been observed before. Changes in the PDS are delayed, but more rapid than changes in the light curve. Flip-flops occur in two intervals within the outburst, separated by about two weeks in which these phenomena were not seen. Transitions between the two flip-flop states occurred at random integer multiples of a fundamental period of 2.761 ks in the first interval and 2.61 ks in the second. Spectral analysis reveals the high and low flux flip-flop states to be very similar, but distinct from intervals lacking flip-flops. A change of the inner temperature of the accretion disc is responsible for most of the flux difference in the flip-flops. We also highlight the importance of correcting for the influence of the dust scattering halo on the X-ray spectra.

Theoretical insights into excited-state process for the novel 2,3-bis[(4-diethylamino-2-hydroxybenzylidene)amino]but-2-enedinitrile system 期刊论文 OAI收割
JOURNAL OF THE CHINESE CHEMICAL SOCIETY, 2019, 页码: 8
作者: Xu, Lei; Zhang, Tianjie; Yang, Dapeng; Zhang, Qiaoli

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收藏 | 浏览/下载：65/0 | 提交时间：2019/12/02

charge redistribution ESDPT intramolecular hydrogen bonds IR vibrational spectra potential energy curves

The investigation of proton transfer and fluorescence-sensing mechanisms of [2-(2-hydroxy-phenyl)-1H-benzoimidazol-5-yl]-phenyl-methanone 期刊论文 OAI收割
JOURNAL OF THE CHINESE CHEMICAL SOCIETY, 2019, 卷号: 66, 期号: 6, 页码: 583-588
作者: Yang, Dapeng; Zhao, Zhongjian; Jia, Min; Song, Xiaoyan; Zhang, Qiaoli

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收藏 | 浏览/下载：191/0 | 提交时间：2019/12/02

deprotonation fluoride-triggered fluorescence response intra and interhydrogen bonds potential energy curves

Theoretical elaboration about the excited state dynamical behaviors for a novel fluorescent sensor 期刊论文 OAI收割
JOURNAL OF PHYSICAL ORGANIC CHEMISTRY, 2019, 卷号: 32, 期号: 5, 页码: 7
作者: Zhang, Tianjie; Zhang, Qiaoli; Lu, Xuemei; Jia, Min; Song, Xiaoyan

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收藏 | 浏览/下载：80/0 | 提交时间：2019/06/20

charge redistribution ESIPT intramolecular hydrogen bond potential energy curves

Theoretical exploration about excited state proton transfer mechanism for a series of phenol-quinoline compounds 期刊论文 OAI收割
JOURNAL OF THE CHINESE CHEMICAL SOCIETY, 2019, 卷号: 66, 期号: 4, 页码: 371-376
作者: Zhang, Tianjie; Yang, Guang; Jia, Min; Song, Xiaoyan; Yang, Dapeng

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收藏 | 浏览/下载：65/0 | 提交时间：2019/06/25

ESIPT intramolecular hydrogen bond IR spectra MOs potential energy curves

The excited state hydrogen bond and proton transfer mechanism of a novel dye CS-Azine 期刊论文 OAI收割
JOURNAL OF PHYSICAL ORGANIC CHEMISTRY, 2019, 卷号: 32, 期号: 2, 页码: 8
作者: Zhang, Qiaoli; Yang, Dapeng; Jia, Min; Yang, Guang; Song, Xiaoyan

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收藏 | 浏览/下载：28/0 | 提交时间：2019/06/20

charge redistribution intramolecular hydrogen bond potential energy curves

The excited state hydrogen bond and proton transfer mechanism of a novel dye cs-azine 期刊论文 iSwitch采集
Journal of physical organic chemistry, 2019, 卷号: 32, 期号: 2, 页码: 8
作者: Jia, Min; Yang, Guang

收藏 | 浏览/下载：37/0 | 提交时间：2019/05/08

Charge redistribution Intramolecular hydrogen bond Potential energy curves