A new imaging-based method for alignment of multiple laser beams

Yifrach, Yair; Rahimi, Rami; Portnov, Alexander; Bar, Ilana

doi:10.1016/j.saa.2020.118404

Cited by 7 publications

(9 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Indeed, the investigation of different isolated neutral − and protonated NTs − and their hydrated clusters ,,− by various spectroscopic methods and quantum chemical calculations allowed us to obtain insight into electronic, vibrational, rotational, and energetic properties, conformational preferences, their potential energy surfaces (PESs), and scantly on the noncovalent interactions (NCIs). Specifically, the similarities between measured and calculated vibrational spectra enabled identification of the probed conformers existing in the molecular beam (MB).…”

Section: Introductionmentioning

confidence: 99%

Experimental/Computational Study on the Impact of Fluorine on the Structure and Noncovalent Interactions in the Monohydrated Cluster of ortho-Fluorinated 2-Phenylethylamine

2022

Self Cite

View full text Add to dashboard Cite

Fluorine-containing medicinal compounds frequently allow modulation of physical−chemical properties. Here, we address the effect of fluorine, near the ethylamino side chain, on conformational flexibility and noncovalent interactions (NCIs) of the selected jet-cooled monohydrated cluster of 2-(2-fluoro-phenyl)-ethylamine (2-FPEA) by massselected resonance-enhanced two-photon ionization and ionization-loss stimulated Raman spectroscopies. Our results show that Raman spectral signatures of the 2-FPEA−H 2 O cluster match the scaled harmonic vibrational Raman frequencies, resulting from density functional theory calculations of the most stable 2-FPEA gauche conformer hydrogen-bonded (HB) to water, confirming the three-dimensional cluster structure. This predicted electronic structure, together with NCI analysis, allows visualization and assessment of the attractive and repulsive interactions. The comparison of the NCIs and revealed red (O−H and N−H stretches) and blue shifts (C−H stretches and CH 2 out-of-plane bends) of the cluster to other class members confirm O−H••• N, N−H•••π, C−H•••O, and C−H•••F HB formation and their contribution to structure stabilization, uncovering the potential of the approach.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental/Computational Study on the Impact of Fluorine on the Structure and Noncovalent Interactions in the Monohydrated Cluster of ortho-Fluorinated 2-Phenylethylamine

2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…KESMI and VMI measurements are performed by the TOFMS used in our previous studies. ,, This TOFMS includes a source and a differentially pumped detection chamber, separated by a skimmer. The AB/MB are produced by either neat Ar buffer gas at a stagnation pressure of 2 bar or by passing it through H 2 O vapor.…”

Section: Methodsmentioning

confidence: 99%

“…The imaging measurements require the determination of appropriate lens voltages for charged particle detection via KESMI (SST or DST operational modes) and VMI, i.e., the V R voltages, the V E / V R ratios, and the polarities, depending on the detected particles. Initial alignment of the laser beam is achieved by sampling the parent ion in SMI, allowing to find an accurate lens position for locating the focused laser beam in the center of the AB/MB. The monitoring of the KESMIs of the emitted PEs from ionized Ar/H 2 O is at V R = −750 V and following the adjustment of the V E / V R values to obtain the proper conditions for acquiring the narrowest and symmetric patterns, which we test by comparing and obtaining identical vertical intensity profiles (see below).…”

Section: Methodsmentioning

confidence: 99%

“…The patterns that arise appear as expanded horizontal stripes with a suppressed velocity spread. Exploiting the resulting spatial information facilitated the spatially resolved mass spectrometric (MS) imaging of analytes on surfaces and molecular dynamics studies. ,− In particular, the latter showed the spatial height and width of formed atomic and molecular ions and the overall SMI of the AB/MB profiles. ,, In addition, molecular ion visualization helped the temporal and spatial overlap of two laser beams in a noncollinear arrangement, characterizing the 1D, 2D, and 3D imaging modes, and mapping the initial source distribution of electron emission from a surface . Moreover, we demonstrated that SMI assists in aligning and overlapping multiple laser beams for monitoring ionization-loss stimulated Raman spectra and in pump–probe experiments in general.…”

Section: Introductionmentioning

confidence: 90%

“…Beginning with the invention of VMI, the possibility of applying an “out-of-focus” lens setting (originally lower and then higher − V E / V R ratios compared to those obtained from VMI) in similar or upgraded systems resulted in the spatial map imaging (SMI) method. In this operational mode, SMIs are observed due to trajectories ending at the detector that map the initial spatial coordinates of particles.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Kinetic Energy-Broadened Spatial Map Imaging for Recovering Dynamical Information

2022

Self Cite

View full text Add to dashboard Cite

The highly successful velocity map imaging (VMI) technique plays a central role in revealing light−matter interactions. Here we demonstrate the related but distinct kinetic energy-broadened spatial map imaging (KESMI) option for recovering KE and angular recoil information on photophysical processes using a VMI system operating in different outof-focus modes. The characteristic single or double stripes and related steps in the vertical intensity profiles of KESMIs of photoelectrons (PEs) from Ar ionization allow breakthrough developments of a potent global model that enables an understanding and analysis of these patterns. These signatures reflect the relationship between the observed features and predicted convolved discrete KEs and angular distributions. The derivation of the velocity distribution of the PEs ensuing from the ionization of a single H 2 O quantum state based on the measured and simulated KESMI provides another rigorous test demonstrating and realizing the feasibility of this new approach, which holds future promise on its own or combined with VMI.

show abstract

Synergistic Spectroscopic and Computational Characterization Evidencing the Preservation or Flipping of the Hydroxyl Group of 2-Phenylethyl Alcohol upon Single and Double Hydration

Rahimi,

Saban,

Bar

2023

J. Am. Chem. Soc.

Self Cite

View full text Add to dashboard Cite

Even apparently simple, obtaining and analyzing observations on molecules and clusters and unambiguously assigning their structures is challenging. We report here the first ionization-loss Raman spectra compared to quantum chemical predictions for establishing the structural preferences of hydrates of the neurotransmitters hydroxy analogue, 2-phenylethyl alcohol (PEAL). The spectra encode two monohydrates and two previously unnoticed dihydrates, consequences of water insertion and sidewise attachment to the O−H group of gauche PEALs, in PEAL-H 2 O and PEAL-(H 2 O) 2 , or the higher-energy gauche-trans PEAL in the latter. The electronic structures retain the stable PEAL or flip its O−H to convert the gauche-trans PEAL conformer to the global minimum-energy dihydrate. We disclose conventional and bifurcated hydrogen bonds and electron steric repulsions by noncovalent interaction analysis and correlations between the experimental O−H stretching vibrational frequencies and the O−H and H•••X bond lengths and electron densities, pointing to implications on hydrate forms and our approach virtue.

show abstract

A new imaging-based method for alignment of multiple laser beams

Cited by 7 publications

References 49 publications

Experimental/Computational Study on the Impact of Fluorine on the Structure and Noncovalent Interactions in the Monohydrated Cluster of ortho-Fluorinated 2-Phenylethylamine

Experimental/Computational Study on the Impact of Fluorine on the Structure and Noncovalent Interactions in the Monohydrated Cluster of ortho-Fluorinated 2-Phenylethylamine

Kinetic Energy-Broadened Spatial Map Imaging for Recovering Dynamical Information

Synergistic Spectroscopic and Computational Characterization Evidencing the Preservation or Flipping of the Hydroxyl Group of 2-Phenylethyl Alcohol upon Single and Double Hydration

Contact Info

Product

Resources

About