Pedro A Enriquez

Universidad de La Rioja (Spain) | UNIRIOJA · Chemistry

La obtención de un espectro atómico o molecular en el laboratorio de prácticas es una actividad muy interesante para los alumnos de Química y Física. Por una parte, se muestra un ejemplo de cómo se utilizan las técnicas de espectroscopia aplicada en disciplinas de la Química y la Física. Por otra parte, es una experiencia didáctica ideal para intro...

El proyecto eNCLaUsTrA2 que presentamos en esta comunicación surge de la reflexiones que realizamos durante la preparación y desarrollo de las prácticas de laboratorio de la asignatura Complementos de Formación Disciplinar (esp. Física y Química) del Máster en Profesorado. En el curso 2020-21, consecuencia de las medidas sanitarias adoptadas debido...

The dynamics of the O(3P) + CH4(X1A1) →OH(X2∏) + CH3(X2A”1) reaction and its isotopic variant with CD4 was studied at several collision energies (Ecol) of experimental interest, using the quasiclassical trajectory (QCT) method on the ground potential energy surface (GHMS PES). This ab initio analytical PES, previously developed using the O-X-(CX3)...

The O((3)P) + CH(4) reaction has been investigated using the quasi-classical trajectory (QCT) method and an ab initio pseudotriatomic potential energy surface (PES). This has been mainly motivated by very recent experiments which support the reliability of the triatomic modeling even at high collision energy (<E(col)> = 64 kcal mol(-1)). The QCT re...

Curso de introducción a la programación en Fortran 90.

Reaction cross-section, product energy and angular distributions for the OH+D2→HOD+D reaction have been calculated using the quasiclassical trajectory method with the recently developed YZCL2 potential energy surface at 0.28 eV collision energy. Although the calculated cross-section, σr=0.077±0.002 Å2, underestimates the experimental value, σr=0.22...

We studied the effects of collision energy (ET) on the dynamics of the title reaction using the quasiclassical trajectory method on an analytical triatomic potential energy surface that we had derived for this system. We compared the dependence of the scalar and two-vector properties of the reaction on ET with experimental data and obtained a quite...

The full characterization of the nascent OH(X(2)Pi, nu'', N'', J', Lambda") state distributions for the O(D-1) + C2H6 --> OH + C2H5 reaction has been experimentally performed using the laser-induced fluorescence technique to probe the nu" = 0-4 levels of the OH molecules. This thorough study has been carried out for the first time using the N2O pho...

The full characterization of the OH(, v″=0–3, N″, J″, Λ″) product state distributions for the reaction was experimentally performed using the laser-induced fluorescence (LIF) technique. Statistical spin–orbit distributions were obtained, while some preference for the formation of the Π(A′) Λ-doublet level was observed. The rovibrational populations...

A study of the collision energy effects on the dynamics of the title reaction was performed using the quasi-classical trajectories (QCT) method and an analytical triatomic potential energy surface recently derived by our group. Scalar and two-vector properties of the reaction were analysed in terms of the collision energy. The results obtained can...

The influence of the collision energy (E T) on the O( 1D) + RH → OH(X 2H) + R (RH = CH 4, C 2H 6, and C 3H 8) reaction dynamics has been studied, using the N 2O photodissociation at 193 nm as O( 1D) precursor (〈E T〉 = 0.403 eV) and probing the OH v″ = 0 and 1 levels by LIF. A triatomic QCT study of the reaction with CH 4 on a fully ab initio based...

The influence of the collision energy (E-T) on the O(D-1) + RH --> OH(X(2)Pi) + R (RH = CH4, C2H6, and C3H8) reaction dynamics has been studied, using the N2O photodissociation at 193 nm as O(D-1) precursor ([E-T] = 0.403 eV) and probing the OH v " = 0 and 1 levels by LIF. A triatomic QCT study of the reaction with CH4 on a fully ab initio based an...

The dynamics of the O(1D)+N2O→NO+NO reaction has been studied using the quasiclassical trajectory (QCT) method on three different triatomic LEPS (London–Eyring–Polanyi–Sato) potential energy surfaces (PES) model. The NO present in the target N2O molecule has been treated as an atom of 30.0 a.m.u. On the basis of the experimental vibrational distrib...

This paper concerns the semiclassical description, calculation and measurement of angular momentum polarization in the products of elementary gas‐phase bimolecular reactions. A unified, semiclassical treatment of the centre‐of‐mass correlated (k,k′,j′) angular distribution involving the reagent and product relative velocity and the product angular...

The application of polarised, Doppler-resolved laser-induced fluorescence (LIF) probing of the products scattered from photon-induced ‘half-collision’(photodissociation) and ‘full-collision’(bimolecular reaction) processes is developed to include the velocity dependence of their stereodynamics. Fourier-transform inversion procedures are used to der...

This paper, which is the companion to the experimental paper (M. Brouard, S. P. Duxon, P. A. Enriquez and J. P. Simons, J. Chem. Soc., Faraday Trans., 1993, 89, 1435) in this issue, is divided into two parts. In the first, equations for the laboratory (LAB) velocity distribution of products generated via photoionitiated bimolecular reaction are pre...

Velocity‐aligned, superthermal O(1D) atoms generated via the photodissociation of N2O have been employed to investigate the stereodynamics of the title reaction. The power of this experimental technique, when coupled with Doppler‐resolved, polarized laser‐induced fluorescence probing of the reaction products, is demonstrated by reference to the spe...

The secondary reaction of velocity aligned, superthermal atoms generated via molecular photodissociation can lead to aligned secondary reaction products. Their vector properties and their quantum state distributions can be measured by using Doppler resolved, polarized laser probe techniques. A simple LAB → CM transformation can thus be used to dete...

Velocity-aligned, superthermal atoms generated via polarised molecular photodissociation have been used to investigate vector correlations of bimolecular reactions. Doppler-resolved, polarised laser-probe techniques can measure correlations between k (the reagents' relative-velocity vectors), k′ (the reaction products' velocity vectors) and J′ (the...

The secondary reaction of velocity aligned, superthermal atoms generated via molecular photodissociation can lead to aligned secondary reaction products. Their vector properties and their quantum safe distributions can be measured by using Doppler resolved, polarized laser probe techniques. A simple LAB â CM transformation can thus be used to deter...

The state resolved stereodynamics of bimolecular reactions can be probed using velocity aligned photofragments as reagents, and polarised, Doppler resolved laser detection techniques for the products. The new strategy and its application to the reaction O(1D) + N2O→ NO + NO are outlined.