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  • 曾文碧 博士
    Physical Chemistry Chemical Physics, 21, 9665-9671 (2019).
    The resonance-enhanced multiphoton ionization (REMPI) of a mixed sandwich complex has been achieved for the first time when exciting (η7-C7H7)(η5-C5H5)Cr via the Rydberg 4pz state. The REMPI spectrum is indicative of unexpectedly small changes of the sandwich geometry on excitation. Time- dependent DFT calculations reveal fine effects of the ligand nature on the molecular and electronic structure variations accompanying electronic excitation. Different trends are predicted for the sandwich geometry transformations in the mixed sandwich complex and its symmetric isomer, (η6-C6H6)2Cr, both on Rydberg excitation and ionization.
  • 謝佳龍 博士
    ACS Nano, Just Accepted (2019).
    Single-molecule tracking is a powerful method to study molecular dynamics in living systems including biological membranes. High-resolution single-molecule tracking requires a bright and stable signal, which has typically been facilitated by nanoparticles due to their superb optical properties. However, there are concerns about using a nanoparticle to label a single molecule because of its relatively large size and the possibility of crosslinking multiple target molecules, both of which could affect the original molecular dynamics. In this work, using various labeling schemes, we investigate the effects of the use of nanoparticles to measure the diffusion of single membrane molecules. By conjugating a low density of streptavidin (sAv) to gold nanoparticles (AuNPs) of different sizes (10, 15, 20, 30, and 40 nm), we isolate and quantify the effect of ...
  • 余慈顏 博士
    Annals of Clinical and Translational Neurology, DOI:10.1002/acn3.50887
    Objective: Ala97Ser (A97S) is the major transthyretin (TTR) mutation in Taiwanese patients of familial amyloid polyneuropathy (FAP), characterized by a late-onset but rapidly deteriorated neuropathy. Tafamidis can restore the stability of some mutant TTR tetramers and slow down the progression of TTR-FAP. However, there is little understanding of the biophysical features of A97S-TTR mutant and the pharmacological modulation effect of tafamidis on it. This study aims to delineate the biophysical characteristics of A97S-TTR and the pharmacological modulation effect of tafamidis on this mutant.Method: The stability of TTR tetramers was assessed by urea denaturation and differential scanning calorimetry. Isothermal titration calorimetry (ITC) was used to measure the binding constant of tafamidis to TTR. Nuclear magnetic resonance spectroscopy (NMR) tit ...
  • 林育如 博士
    Physical Review Letters 121, 250401 (2018).
    We realize synthetic azimuthal gauge potentials for Bose-Einstein condensates along with spin-orbital-angular-momentum coupling. This is achieved by engineering atom-light interactions. We characterize the spin textures of the atoms and exploit the azimuthal gauge potential to demonstrate the Hess-Fairbank effect, the analogue of Meissner effect in superconductors. Our demonstration serves as a paradigm to create topological excitations by tailoring atom-light interactions where both types of SO(3) vortices in the     manifold, coreless vortices and polar-core vortices, are created in our experiment. The gauge field in the stationary Hamiltonian opens a path to investigating rotation properties of atomic superfluids under thermal equilibrium.
  • 許良彥 博士
    Journal of Chemical Physics 151, 014105 (2019).
    We study a molecular emitter above a silver surface in the framework of macroscopic quantum electrodynamics and explore the population dynamics including non-Markovian effects. The theory we present is general for molecular fluorescence in the presence of dielectrics with any space-dependent, frequency-dependent, or complex dielectric functions. Furthermore, the proposed theory allows us to calculate the memory kernel of polaritons using computational electrodynamics packages. In the limit of a high vibration frequency, the different strengths of exciton-polariton couplings lead to distinct characteristics in the population dynamics, e.g., Franck-Condon-Rabi oscillation. (The frequency of Rabi oscillation is dependent on the Franck-Condon factor.) Additionally, in a specific condition, we derive a parameter-free formula that can be used to estimate ...
  • 張煥正 博士
    ACS Appl. Mater. Interfaces 12, 3847−3853 (2020).
    Fluorescent nanodiamond (FND) containing nitrogen-vacancy (NV) centers as built-in fluorophores exhibits a nearly constant emission profile over 550 – 750 nm upon excitation by vacuum-ultraviolet (VUV), extreme ultraviolet (EUV), and X- radiations from a synchrotron source over the energy (wavelength) range of 6.2 – 1450 eV (0.86 – 200 nm).  The photoluminescence (PL) quantum yield of FND increases steadily with the increasing excitation energy, attaining a value as great as 1700% at 700 eV (1.77 nm).  Notably, the yield curve is continuous, having no gap in the VUV to X-ray region.  In addition, no significant PL intensity decreases were observed for hours.  Applying the FND sensor to measure the absorption cross sections of gaseous O2 over 110 – 200 nm and comparing the measurements with ...
  • 林志民 博士
    Angew. Chem. Int. Ed. (DOI: 10.1002/anie.201900711, 2019).
    Recent reports [Jara‐Toro et al., Angew. Chem. Int. Ed. 2017, 56, 2166 and PCCP 2018, 20, 27885] suggest that the rate coefficient of OH reactions with alcohols would increase by up to two times in going from dry to high humidity. This finding would have an impact on the budget of alcohols in the atmosphere and it may explain differences in measured and modeled methanol concentrations. The results were based on a relative technique carried out in a small Teflon bag, which might suffer from wall reactions. The effect was reinvestigated using a direct fluorescence probe of OH radicals, and no catalytic effect of H2O could be found. Experiments in a Teflon bag were also carried out, but the results of Jara‐Toro et al. were not reproducible. Further theoretical calculations show that the water‐mediated reactions have negligible rates compared to  ...
  • 陳貴賢 博士
    Nature Communications 10, Article number: 1721 (2019).
    當前綠能與儲能等研究領域中,設計高導電金屬有機骨架聚合物(MOF)是極具應用潛力的主題。本研究藉由設計銅硫(–Cu–S–)n二維平面於MOF結構之策略來實現高導電MOF之特性。利用水熱法,有機配基6,6’-dithiodinicotinXic acid因原位裂解S–S鍵形成6-mercaptonicotinic acid (1,6-Hmna)與6-mercaptonicotinate (6-mn),並與硝酸銅反應合成MOF化合物{[Cu2(6-Hmna)(6-mn)]·NH4}n。經各種材料分析發現該化合物具(–Cu–S–)n二維平面結構、低活化能(6 meV)、小帶隙(1.34 eV)、及高電導率(10.96 S cm−1)等特性,適用於電池、熱電、超級電容器等相關領域。本研究是由中研院化學所呂光烈、中研院原分所陳貴賢、台大凝態科學中心林麗瓊與台北科大化 ...
  • 高橋開人 博士
    Journal of Physical Chemistry A, 123, 5300-5308.
    Unsaturated carbon cluster chains often have chemical properties depending on the cluster size. While carbon cluster cation chains show odd−even variation in the reactivity with hydrogen, thechemistry of the carbon anion chain has been poorly understood even for the bimolecular reaction with hydrogen. We present a systematic theoretical study based on transition state calculations and molecular dynamics trajectory simulations for the reaction of Cn (n = 2−8) + H2. We show that carbon cluster chain anion also has an odd−even variation in reactivity where the even ones are more reactive. In addition, dynamics trajectory shows that while odd n only resulted in the CnH2 product with direct H insertion similar to the static reaction pathway, even  ...

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演講資訊

Mar
05
2020
Photoinduced Dynamics Studied by Ultrafast Single-Shot Pump-Probe Spectroscopy
鄭宇翔助理教授, 國立臺灣大學電機工程學系
2020-03-05 下午 03:30  浦大邦紀念講堂
Mar
12
2020
Plasmonics for Nonlinear Frequency Conversion and Topological Effects
黃承彬教授, 國立清華大學光電工程研究所
2020-03-12 下午 03:30  浦大邦紀念講堂

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