Here we report the investigation of magnetization dynamics a vanadyl complex with diethyldithiocarbamate (Et2dtc–) ligands, namely [VO(Et2dtc)2] (1), in both solid-state and frozen solution. This showed an anomalous unprecedentedly observed field dependence relaxation time, which was modeled three contributions to mechanism. The temperature weight two processes dominating at low fields found well correlate energy vibrations as determined by THz spectroscopy. detailed experimental comparative...

The spectral purity of quantum cascade lasers (QCL) suggests their use in high-precision metrology applications at terahertz wavelengths. By combining a QCL with THz frequency comb, scientists have been able to measure the rotational transition gas (methanol) record-breaking precision four parts one billion.

We propose a time-resolved optical Kerr effect study of the structural and vibrational dynamics hydration water surrounding lysozyme on very fast time scale. Measurements as function concentration make it possible to distinguish contribution from that both bulk protein. Our results provide experimental evidence existence two water, associated with hydrogen bond exchange relaxation process reorganization molecules induced by protein fluctuations. Likewise, we evaluated layer at subpicosecond...

Molecular electronic spins are good candidates as qubits since they characterized by a large tunability of their and magnetic properties through rational chemical design. Coordination compounds light transition metals promising systems for spin-based quantum information technologies, thanks to long spin coherence times up room temperature. Our work aims at presenting an in-depth study on how the spin-phonon coupling in vanadyl-acetylacetonate, [VO(acac)2], can change function temperature...

The low frequency (nu < 500 cm(-1)) vibrational spectra of hydrated porous silica are specifically sensitive to the hydrogen bond interactions and provide a wealth information on structural dynamical properties water contained in pores matrix. We investigate systematically this spectral region for series Vycor samples (pore size approximately equal 4 nm) at different levels hydration, from dry matrix completely filled pores. obtained as Fourier transforms time-resolved heterodyne detected...

The dynamics of the fragile glass-forming orthoterphenyl have been investigated by transient grating experiments with an heterodyne detection technique. We measured relaxation processes this glass former over more than six decades in time excellent signal-to-noise ratio. Acoustic, structural, and thermal relaxations clearly identified a time-frequency window not covered previous spectroscopic studies their characteristic dynamic parameters as function temperature wave vector. A detailed...

Dry and wet drawing materials were investigated by THz time-domain spectroscopy in transmission mode. Carbon-based iron-gall inks have been studied, some prepared following ancient recipes others using current synthetic materials; a commercial ink was studied as well. We measured the signals on thin film of liquid deposited polyethylene pellicles, comparing results with thick pellets dried blended powder. This study required implementation new experimental method data analysis procedure able...

We report results from a heterodyne-detected transient grating experiment on liquid and supercooled water in wide temperature range, -17.5 to 90 degrees C. The measured signal covers an extremely large time window with excellent signal-to-noise ratio that enables the investigation single of sound speed attenuation, thermal diffusivity, dependence dielectric constant. experimental data clearly show effect density fluctuations function. In order describe results, we introduce comprehensive...

The time-resolved optical Kerr effect spectroscopy (OKE) is a powerful experimental tool enabling accurate investigations of the dynamic phenomena in molecular liquids. We introduced innovative and fitting procedures, that enable safe deconvolution sample response function from instrumental function. This critical issue order to measure dynamics liquid water. report OKE data on water measuring intermolecular vibrations structural relaxation processes an extended temperature range, inclusive...

The results of a Transient Grating experiment in supercooled molecular liquid anisotropic molecules and its theoretical interpretation are presented. These show the existence two distinct dynamical contributions response function this experiment, density orientation dynamics. dynamics can be experimentally disentangled by varying polarisation probe diffracted beams they have been identified measured Heterodyne Detected performed on m-toluidine. theory good qualitative agreement with...

We report the results of a series ultrasound, Brillouin scattering, and optical heterodyne detected transient grating experiments performed on LiCl, 6H(2)O solution from room temperature down to vicinity its liquid-glass transition, T(g) approximately 138 K. Down T 215 K, supercooled liquid has behavior similar what is expected for water: zero frequency sound velocity, C(0), continuously decreases while corresponding infinite C(infinity), sharply increases, reflecting increasing importance H...

We report heterodyne detected transient grating measurements on water confined in the hydrophilic porous glass Vycor7930 range of temperature from −15 to 90 °C. With this experiment we are able obtain maximum density by measuring when thermal expansion coefficient vanishes. found, similarly what is already reported literature hydrophobic confinement, that shifts lower temperatures. at −1±1 No experimental evidence a shift systems has been previously reported.

The acoustic sound velocity of water in the supercooled regime shows peculiar behaviour. According to available data, displays complex behaviour below −15°C, where anomalous frequency dispersion phenomena seem appear and need be understood. In particular, lower-frequency data at a few tens KHz show levelling-off value −25°C, with possible minimum around −30°C. Other higher frequencies, 1 GHz, comparison low-frequency could instead suggest existence 'negative dispersion'; yet other...

Homogeneous melting of crystals is a complex multistep process involving the formation transient states at temperatures considerably higher than point. The nature and persistence these metastable structures are intimately connected to process, precise definition temporal boundaries phenomena not yet available. We set up specifically designed experiment probe by infrared absorption spectroscopy entire dynamics, ranging from tens picoseconds microseconds, superheating an ice crystal. In spite...

The study of materials for space exploration is one the most interesting targets international agencies. An essential tool realizing light junctions epoxy adhesive (EA), which provides an elastic and robust material with a complex mesh polymeric chains crosslinks. In this work, structural chemical modification commercial two-part flexible EA (3M™ Scotch-Weld™ EC-2216 B/A Gray), induced by 60Co gamma radiation, presented. Combining different spectroscopic techniques, such as Fourier transform...

We have performed time-resolved optical Kerr effect experiments with heterodyne detection on benzene. succeeded in supercooling benzene by 21 K below the melting point T m = 279 K, and we investigated full range of existence from supercooled phase up to boiling b 353 K. Our data show clearly complex relaxation pattern that is characterized different time scales. These dynamic features, common many other molecular liquids, date not been addressed there a unique theoretical model able explain...

Using heterodyne-detected optical Kerr effect (HD-OKE) measurements, we investigate the vibrational dynamics and structural relaxation of water nanoconfined in Vycor porous silica samples (pore size ≃ 4 nm) at different levels hydration temperatures. At low corresponding to two complete superficial layers, no freezing occurs remains mobile all investigated temperatures with dynamic features similar, but not equal to, bulk water. The fully hydrated sample shows formation ice about 248 K. This...

In this paper, the study of a plasma diagnostic system based on THz time domain spectroscopy technique is presented. Such could potentially probe large part electromagnetic spectrum currently covered by several other diagnostics in single measurement. This feature, keeping mind basic requirements for nuclear fusion experiments, such as robustness and hard environment applicability, well durability low maintenance, makes great interest. A conceptual design THz-TDS has been developed, starting...