Topic
Femtosecond
About: Femtosecond is a research topic. Over the lifetime, 35106 publications have been published within this topic receiving 691405 citations. The topic is also known as: 1 E-15 s & fs.
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TL;DR: In this paper, the relaxation of the O-H stretch vibration in a dilute HDO:D2O solution using femtosecond mid-infrared pump-probe spectroscopy was studied.
Abstract: We present a study on the relaxation of the O–H stretch vibration in a dilute HDO:D2O solution using femtosecond mid-infrared pump-probe spectroscopy. We performed one-color experiments in which the 0→1 vibrational transition is probed at different frequencies, and two-color experiments in which the 1→2 transition is probed. In the one-color experiments, it is observed that the relaxation is faster at the blue side than at the center of the absorption band. Furthermore, it is observed that the vibrational relaxation time T1 shows an anomalous temperature dependence and increases from 0.74±0.01 ps at 298 K to 0.90±0.02 ps at 363 K. These results indicate that the O–H⋯O hydrogen bond forms the dominant accepting mode in the vibrational relaxation of the O–H stretch vibration.
207 citations
TL;DR: In this article, femtosecond laser pulses were used to create colloidal particles of Ag in water at 800 nm, and the size of colloid particles was compared with those of colloidal particle prepared by nanosecond pulses.
207 citations
TL;DR: In this paper, femtosecond pump-probe experiments are combined with computer simulations using the recently established crystal structure of these systems to assess the nature of excitation motion.
Abstract: We have studied excitation energy transfer in the photosynthetic antenna systems LH1 and LH2 of purple bacteria. Femtosecond pump−probe experiments are combined with computer simulations using the recently established crystal structure of these systems to assess the nature of excitation motion. We have measured the transient absorption kinetics and spectra of the LH1 and LH2 complexes in the temperature range from 4.2 to 296 K with femtosecond time resolution. The calculations based on the Pauli master equation disagreed with experimentally measured population and anisotropy kinetics, suggesting that the simple model of excitation hopping between bacteriochlorophyll a molecules is not a proper description for energy transport in LH1 and LH2. As a next step we have used the exciton theory to reproduce the transient absorption spectra of LH2, and we found that the coherence length of the exciton in B850 of LH2 1.5 ps after excitation of B800 is 4 ± 1.
207 citations
TL;DR: Using terahertz (10(12) Hz) emission spectroscopy and exploiting the spin-orbit interaction, this work demonstrates the optical generation of electric photocurrents in metallic ferromagnetic heterostructures at the femtosecond timescale.
Abstract: The spin–orbit interaction can be used to optically generate and control terahertz electric photocurrents in metallic ferromagnetic heterostructures.
207 citations
TL;DR: In this article, a new type of permanent damage obtained in bulk fused silica by focusing IR femtosecond laser pulses with microjoule energy was reported, which consists of an uniaxial birefringence zone over a lateral size of a few microns and a depth of several tens of microns.
207 citations