The effect of terahertz (THz) radiation on deep tissues human body has been considered negligible due to strong absorption by water molecules. However, we observed that the energy THz pulses transmits a millimeter thick in aqueous solution, possibly as shockwave, and demolishes actin filaments. Collapse filament induced irradiation was also living cells under an medium. We confirmed viability cell not affected exposure pulses. potential waves invasive method alter protein structure is demonstrated.

Rotational wave packet revivals on an excited electronic state have been measured by femtosecond time-resolved photoelectron imaging for the first time. The full revival at 82 ps of S1 (n,pi*) pyrazine was clearly observed in time dependencies intensity and angular distribution (PAD). PAD, laser aligned pyrazine, reflects different characters pi* 3s molecular orbitals.

Phycobilisomes are antenna protein complexes in cyanobacteria and red algae. In phycobilisomes, energy transfer is unidirectional with an extremely high quantum efficiency close to unity. We investigate intraprotein relaxation coherence of constituent chromoproteins allophycocyanin (APC) two kinds C-phycocyanin (CPC) phycobilisomes using two-dimensional electronic spectroscopy (2D-ES). These have similar adjacent pairs pigments $\alpha$84 $\beta$84, which excited delocalized exciton states....

Nuclear spin angular momentum in molecules with identical nuclei is conserved many physical and chemical processes, but its role reactions involving atomic rearrangements remains underexplored. In this study, we investigate the nuclear selection rules reaction between methylene (CH2) hydrogen (H2) using high-resolution infrared spectroscopy quantum solid parahydrogen. Our results show that triplet (3CH2) reaction, distribution of products matches perfectly expected for stepwise mechanism....

Phycobilisomes are antenna protein complexes in cyanobacteria and red algae. In phycobilisomes, energy transfer is unidirectional with an extremely high quantum efficiency close to unity. We investigate intraprotein relaxation coherence of constituent chromoproteins allophycocyanin (APC) two kinds C-phycocyanin (CPC) phycobilisomes using two-dimensional electronic spectroscopy. These produced by Escherichia coli expression system have similar adjacent pairs pigments α84 β84, which excited...

We have numerically examined optimization of the experimentally achievable shapes mid-infrared femtosecond laser pulses to construct elementary quantum gates using molecular rovibrational states a single molecule. Instead optimizing electric field by optimal control theory, method generally used in theoretical studies coherent control, transmittance and phase shift conventional pulse shapers were optimized frequency domain genetic algorithm. The target system we was rotation-vibration CO...

A novel design for a contact grating device with an incorporated Fabry-Perot resonator is proposed high-power terahertz (THz) light generation. We deposited multilayer consisting of Ta(2)O(5) and Al(2)O(3) on magnesium-doped stoichiometric LiNbO(3) substrate fabricated grooves the outermost layer. The was designed such that conditions were satisfied diffracted by grating. Consequently, fraction transmitted into substrate, i.e., diffraction efficiency, enhanced resonator. efficiency 71%,...

We have developed a 1 kHz repetition picosecond laser system dedicated for intense terahertz (THz) pulse generation. The comprises chirped amplification equipped with Yb:YAG thin-disk amplifier. At room temperature, the regenerative amplifier provides pulses having energy of over 10 mJ and spectral bandwidth 1.2 nm. duration achieved after passage through diffraction grating pair compressor was 1.3 ps. By employing this as pump source, THz peak frequency 0.3 4 µJ were generated by means...

Abstract We demonstrate photoacoustic wave propagation with a plane wavefront in liquid water using terahertz (THz) laser pulse. The THz light can effectively generate the because of strong absorption via stretching vibration mode hydrogen bonding network. excitation large-area surface irradiated by loosely focused produces wave. This is contrast conventional methods absorbers or plasma generation near-infrared light. and are observed system free-electron shadowgraph imaging. generated...

The OH(v′=4, N′=1) products of the photon-initiated reaction O(1D2)+H2(v=0)→OH(v′, N′)+H have been probed using Doppler-resolved laser induced fluorescence. data are used to extract product state-resolved differential cross-section and excitation function. state-specific angular distribution displays pronounced forward–backward peaks with a bias for backward scattering. experimental compared results QCT calculations, two alternative abinitio versions ground 11A′ potential energy surface,...

Two-color and one-color resonance enhanced multiphoton ionization photoelectron spectroscopies (REMPI–PES) have been applied to Rydberg states (n=3) of jet-cooled pyrazine. The 3s 3p members series converging the ground state (n−1) cation member a an excited (π−1) were observed. angular distributions (PADs) measured via 3s(n−1) drastically differed for two-color REMPI experiments. This behavior is ascribed different molecular axis alignments created by two-photon excitation schemes. PADs...

Ultrafast electronic dephasing from the S1(nπ*) state and energetics of n = 3 Rydberg states pyridine were studied by time-resolved photoelectron imaging in conjunction with (1+2') resonance-enhanced multiphoton ionization (REMPI) via S1 state. The lifetime at origin was determined to be 32 ± 5 ps decay total photoionization signal. Photoelectron energy angular distributions observed for REMPI clearly indicated that two-photon is being enhanced resonance singlet 3s(n-1) 3p(n-1) have not been...

We investigated liquid-sheet jets with controllable thickness for application to terahertz (THz) spectroscopy. Slit-type and colliding-jet nozzles were used generate optically flat liquid jets. The of the sheet was determined precisely by spectral interference THz time-domain-spectroscopy methods. By adjusting collision angle nozzle, we could control from 50 120 μm.

A novel technique for the terahertz (THz) tomography of a photo-induced carrier that is based on optical-pump THz-probe time-resolved reflection spectroscopy using counterpropagation geometry pump and probe pulses has been proposed. Transient due to provides information about physical properties spatial distribution separately. We have experimentally demonstrated this method silicon wafer. The obtained complex can be reproduced by exact solution Maxwell's equations, assuming an exponential density.

Femtosecond time-resolved photoelectron imaging was applied to (1+2') resonance-enhanced multiphoton ionization of deuterated pyrazine. The resonances with the 3s and 3p Rydberg states rotational dephasing on a picosecond time-scale were observed similarly pyrazine-H4. photoionization dynamics pyrazine-D4 found be identical that H4 at wavelength 393 nm. No signature influence superexcited upon ionization.

Femtosecond time-resolved photoelectron imaging (TR-PEI) is applied to the (1 + 2') resonance-enhanced multiphoton ionization of pyrazine (1,4-diazabenzene) via S1 state. The intersystem crossing (ISC) from (nπ*) T1 state and dynamics 3s 3pz Rydberg states are investigated. Rotational revival features, observed in intensities populated by ISC as well optically prepared state, analyzed detail. alignment at rotational time found be much smaller than that Numerical calculations, using molecular...

We have calculated the propagation of rovibrational wave-packet in $^{1}\ensuremath{\Sigma}$ state $\mathrm{CO}$ and $^{2}\ensuremath{\Pi}$ $\mathrm{NO}$ manipulated by shaped midinfrared femtosecond laser pulses. The rotational states molecules were fully taken into account calculation effects vibrational evolution examined detail. As a result, it is found that excitations associated with excitation affect drastically, which suggests should not be ignored when are used as target for...

Photoelectron angular distributions in the laboratory frame (LF-PADs) from A(2Σ+) state of NO molecule were measured by femtosecond time-resolved photoelectron imaging with (1+1′) resonance enhanced multiphoton ionization via A state. High-precision measurements anisotropy parameters LF-PADs performed for kinetic energy 0.03 to 1.05 eV as a function pump-probe delay time. The revival feature rotational wave packet on was clearly observed time dependence parameters. By approximating phase...

Ever increasing demand for high-performance, miniaturized, low-cost, and more environmentally conscious targets set high requirements electronics packaging manufacturing. Digital drop-on-demand printing of materials is an interesting approach manufacturing allowing several advantages compared to subtractive methods manufacture electronics. Additive processing by means digital offers new possibilities integration, enabling direct writing on even nonplanar surfaces, interconnection without...

Clusters of tetracene molecules with different numbers attached (Ar)(N), (Ne)(N) and (H(2))(N) particles (N = 1-2000) are assembled inside superfluid He nanodroplets studied via laser-induced fluorescence. The frequency shift the fluorescence spectrum is as a function cluster size pickup order species. For (Ar)(N) clusters, our results indicate that reside clusters when captured by nanodroplet before species; conversely, stay on surface after In case however, irrespective order. We conclude...

We perform a beat-frequency-resolved analysis for two-dimensional electronic spectroscopy using high-speed and stable 2D spectrometer few-cycle visible laser pulses to disentangle the vibrational coherences in an artificial fluorescent protein. develop highly ultrashort light source that generates 5.3-fs with pulse energy of 4.7 µJ at repetition rate 10 kHz multi-plate compression filamentation gas cell. The above-5.3-fs together multichannel detector enable us measure series spectra, which...

Ultraviolet photodissociation dynamics of the NO dimer into NO(Α)+NO(Χ) in a supersonic molecular beam is studied by femtosecond pump-probe charged particle imaging. Time-resolved photoelectron imaging reveals that photoionization from Franck–Condon region excited state(s) reaches vibrationally states cation, resulting spontaneous fragmentation NO+NO+ even at shortest time delays. The corresponding energy distribution extending up to more than 1 eV above ionization threshold indicates large...

We present high-resolution infrared absorption spectra of chloromethyl radical produced by in situ UV photolysis chloroiodomethane isolated solid parahydrogen. The radicals were stable over a few days parahydrogen kept at 3.6 K. Analysis the rotation-vibration revealed that exhibited quantized one-dimensional rotational motion about C-Cl bond, while ortho and para nuclear spin species still clearly distinguishable spectra. Temporal change indicated conversion between occurred time scale...

We developed a new contact grating device for terahertz (THz) pulse generation by optical rectification. The was made from polycrystalline rutile TiO2 thin film in the region and an amorphous SiO2 layer deposited on Mg-doped LiNbO3 crystal. Our calculations indicated that would yield increase diffraction efficiency of up to 0.69. prepared had sufficient laser induced damage threshold (140 GW/cm2) enable effective THz generation. Using prototype device, we demonstrated investigated...