7 research outputs found

    Femtochemistry under scrutiny: Clocking state-resolved channels in the photodissociation of CH3I in the A -band

    Full text link
    The following article appeared inThe Journal of Chemical Physics 152.1 (2020): 014304 and may be found at https://doi.org/10.1063/1.5134473Clocking of electronically and vibrationally state-resolved channels of the fast photodissociation of CH3I in the A-band is re-examined in a combined experimental and theoretical study. Experimentally, a femtosecond pump-probe scheme is employed in the modality of resonant probing by resonance enhanced multiphoton ionization (REMPI) of the methyl fragment in different vibrational states and detection through fragment velocity map ion (VMI) imaging as a function of the time delay. We revisit excitation to the center of the A-band at 268 nm and report new results for excitation to the blue of the band center at 243 nm. Theoretically, two approaches have been employed to shed light into the observations: first, a reduced dimensionality 4D nonadiabatic wavepacket calculation using the potential energy surfaces by Xie et al. [J. Phys. Chem. A 104, 1009 (2000)]; and second, a full dimension 9D trajectory surface-hopping calculation on the same potential energy surfaces, including the quantization of vibrational states of the methyl product. In addition, high level ab initio electronic structure calculations have been carried out to describe the CH3 3pz Rydberg state involved in the (2 + 1) REMPI probing process, as a function of the carbon-iodine (C–I) distance. A general qualitative agreement is obtained between experiment and theory, but the effect of methyl vibrational excitation in the umbrella mode on the clocking times is not well reproduced. The theoretical results reveal that no significant effect on the state-resolved appearance times is exerted by the nonadiabatic crossing through the conical intersection present in the first absorption band. The vibrationally state resolved clocking times observed experimentally can be rationalized when the (2 + 1) REMPI probing process is considered. None of the other probing methods applied thus far, i.e., multiphoton ionization photoelectron spectroscopy, soft X-ray innershell photoelectron spectroscopy, VUV single-photon ionization, and XUV core-to-valence transient absorption spectroscopy, have been able to provide quantum state-resolved (vibrational) clocking times. More experiments would be needed to disentangle the fine details in the clocking times and dissociation dynamics arising from the detection of specific quantum-states of the molecular fragmentsM.L.M.-S. acknowledges financial support through a predoctoral contract from Universidad Complutense de Madrid. M.E.C. is grateful to the Spanish MINECO for a contract through Programa de Técnicos de Apoyo a Infraestructuras. This work was financially supported by the Spanish MINECO and MICIU (Grant Nos. CTQ2016-75880-P, FIS2016-77889-R, and PGC2018-096444- B-I00). This research was carried out within the Unidad Asociada Química Física Molecular between the Departamento de Química Física of Universidad Complutense de Madrid and CSIC. The facilities provided by the Center for Ultrasfast Lasers of Universidad Complutense de Madrid are acknowledge

    IMPACT-Global Hip Fracture Audit: Nosocomial infection, risk prediction and prognostication, minimum reporting standards and global collaborative audit. Lessons from an international multicentre study of 7,090 patients conducted in 14 nations during the COVID-19 pandemic

    Get PDF

    I.amAble: Apprendre la science au service de l'inclusion scolaire

    No full text
    I.amAble es un proyecto que nació con una filosofía centrada en la utilización de acciones de solidaridad como método de aprendizaje. Se diseñan y organizan talleres científicos inclusivos para realizarlos en parejas formadas por personas con discapacidad cognitiva y de educación secundaria ordinaria. Se pretende aprender a la vez que se da un servicio a la universidad y a la sociedad, y ese es el espíritu que se ha seguido manteniendo durante esta tercera edición del curso 2018-2019.I.amAble is a project that was born with a philosophy focused on the use of solidarity actions as a learning method. Inclusive scientific workshops are designed and organized to conduct them in pairs formed by people with cognitive disabilities and ordinary secondary education. It is intended to learn while providing a service to the university and society, and that is the spirit that has continued to be maintained during this third edition of the 2018-2019 course.I.amAble est un projet né d'une philosophie axée sur l'utilisation des actions de solidarité comme méthode d'apprentissage. Des ateliers scientifiques inclusifs sont conçus et organisés pour les animer par paires formées de personnes ayant une déficience cognitive et un enseignement secondaire ordinaire. Son objectif est d'apprendre tout en offrant un service à l'université et à la société. C'est l'esprit qui a continué à être préservé lors de cette troisième édition du cours 2018-2019.Depto. de Química InorgánicaFac. de Ciencias QuímicasFALSEConsejería de Educación de la Comunidad de MadridSección Territorial de la Real Sociedad Española de Químicasubmitte

    I.amAble: science as a vehicle towards full inclusion

    No full text
    En este proyecto de innovación se persigue enriquecer la formación de los estudiantes de las facultades de ciencias (F. CC.FF. y F. CC.QQ.) mediante una propuesta teórico-práctica basada en la metodología Aprendizaje-Servicio (ApS) y encaminada a facilitar la inclusión de personas con diversidad funcional, especialmente diversidad cognitiva. El proyecto parte del diseño de talleres científicos por los estudiantes universitarios para ser realizados por parejas de estudiantes preuniversitarios de manera colaborativa e inclusiva, ya que un miembro de la pareja procederá de un centro de educación especial y el otro de un centro educativo ordinario (colegio o Instituto de educación secundaria) de la Comunidad de Madrid. Tanto el diseño de los experimentos como su eventual puesta en práctica serán supervisados por los integrantes del proyecto: estudiantes de doctorado, personal de administración y servicios (PAS) y personal docente e investigador (PDI), así como por los colaboradores externos, tanto de centros de educación especial como de centros de enseñanza ordinarios. También se contará con la asesoría pedagógica de PDI de la Facultad de Educación. Las fichas didácticas elaboradas por los estudiantes se harán públicas en la página web del proyecto, vinculada a la Universidad Complutense bajo el nombre I.amAble. Esta plataforma, ya existente, será perfeccionada por estudiantes y PDI de la Facultad de Informática y del Instituto de Tecnología del Conocimiento. De esta manera estarán disponibles con un diseño lo más intuitivo y accesible posible para quienes estén interesados en la divulgación científica desde una perspectiva inclusiva. El equipo informático también desarrollará herramientas que faciliten la elaboración de las fichas como, por ejemplo, la transcripción de textos a pictogramas. El proyecto puede mejorar la calidad de la formación de nuestros estudiantes, desde los aspectos más académicos hasta los más humanistas, como son la profundización en algunos conceptos y su aplicación práctica, el desarrollo de estrategias de comunicación e improvisación, la capacidad de empatía o su contribución al desarrollo del tejido social. Todo ello facilitará su inserción laboral, especialmente en el ámbito de la educación, tanto formal como informal (museos, animación sociocultural, etc.). Este proyecto también contribuirá a la mejora de la cultura científica y a la percepción de nuestra universidad como un espacio abierto a la sociedad y que está a su servicio. Además, facilitará la inclusión de las personas con diversidad funcional mediante el acercamiento compartido a la ciencia.This innovation project seeks to enrich the training of students of science faculties through a theoretical-practical proposal based on the Learning-Service methodology and aimed at facilitating the inclusion of people with functional diversity, especially cognitive diversity. The project is based on the design of scientific workshops by university students to be carried out by pairs of pre-university students in a collaborative and inclusive manner, since one member of the couple will come from a special education center and the other from an ordinary educational center of the Community of Madrid. Both the design of the experiments and their eventual implementation will be supervised by the project members: doctoral students, administration and service staff and teaching and research staff, as well as external collaborators from special education centers as well as ordinary education centers. There will also be pedagogical advisory from the Faculty of Education. The didactic sheets elaborated by the students will be made public on the web page of the project, linked to the Complutense University under the name I.amAble. This platform, already existing, will be improved by students and staff from the IT Faculty and the Institute of Technology of Knowledge. In this way they will be available with a design as intuitive and accessible as possible for those interested in scientific dissemination from an inclusive perspective. The IT team will also develop tools that facilitate the preparation of the files, for example, the transcription of texts to pictograms. The project can improve the quality of the training of our students, from the most academic aspects to the most humanistic ones, such as the deepening of some concepts and their practical application, the development of communication and improvisation strategies, the capacity for empathy or contribution to the development of the social fabric. All this will facilitate their labor insertion, especially in the field of education, both formal and informal (museums, sociocultural animation, etc.). This project will also contribute to the improvement of scientific culture and to the perception of our university as a space open to society and at its service. In addition, it will facilitate the inclusion of people with functional diversity through a shared approach to science.Fac. de Ciencias QuímicasFALSEUniversidad Complutense de MadridReal Sociedad Española de Química - Sección Territorial de MadridCiencias Sin BarrerasConsejería de Educación e Investigación de la Comunidad de Madridsubmitte

    Long-term effect of a practice-based intervention (HAPPY AUDIT) aimed at reducing antibiotic prescribing in patients with respiratory tract infections

    No full text
    corecore