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Author: Abdelmoumen Tabyaoui
Publisher:
ISBN:
Category :
Languages : fr
Pages : 160
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Book Description
Ce travail a été consacré à l'étude des molécules tétraédriques 116SnH4 et 12CF4 par spectroscopie Raman à très haute résolution. Ainsi, nous avons effectué une analyse complète de la diade vibrationnelle (1000, 0010) du stannane à partir des spectres Raman et infrarouge à très haute résolution. L'analyse simultanée des donnés Raman, infrarouge et micro-onde nous a permis de déterminer 4 paramètres de l'état v1=1, 17 paramètres de l'etat v3=1 et 6 paramètres d'interaction pour l'Hamiltonien de la diade développé à l'ordre 5 d'approximation. Une attribution complète des transitions infrarouge a été effectuée jusqu'a J=14. De plus, cette analyse de la diade nous a permis de mettre en évidence un nouveau type d'interaction vibrationnelle entre la diade (1000, 0010) et la tétrade (0300, 0201, 0102, 0003) ; cette interaction devient significative à partir de J=15. D'autre part, nous avons enregistré et analysé les spectres Raman stimulé et CARS à très haute résolution de la bande vibrationnelle (1000) de 12CF4. Ceci nous a permis d'affiner les constantes spectroscopiques de la molécule, notamment les valeurs (D1-D0) et (H1-H0). Nous avons aussi pu r2soudre pour la premi7re fois le spectre de la branche Q du sous-niveau A1 de la bande harmonique (0200). Nous avons fait une attribution complète des transitions rotationnelles jusqu'a J=40 et déterminé un premier lieu de constantes spectroscopiques relatives au sous-niveau A1 de la bande (0200).
Author: Abdelmoumen Tabyaoui
Publisher:
ISBN:
Category :
Languages : fr
Pages : 160
Get Book Here
Book Description
Ce travail a été consacré à l'étude des molécules tétraédriques 116SnH4 et 12CF4 par spectroscopie Raman à très haute résolution. Ainsi, nous avons effectué une analyse complète de la diade vibrationnelle (1000, 0010) du stannane à partir des spectres Raman et infrarouge à très haute résolution. L'analyse simultanée des donnés Raman, infrarouge et micro-onde nous a permis de déterminer 4 paramètres de l'état v1=1, 17 paramètres de l'etat v3=1 et 6 paramètres d'interaction pour l'Hamiltonien de la diade développé à l'ordre 5 d'approximation. Une attribution complète des transitions infrarouge a été effectuée jusqu'a J=14. De plus, cette analyse de la diade nous a permis de mettre en évidence un nouveau type d'interaction vibrationnelle entre la diade (1000, 0010) et la tétrade (0300, 0201, 0102, 0003) ; cette interaction devient significative à partir de J=15. D'autre part, nous avons enregistré et analysé les spectres Raman stimulé et CARS à très haute résolution de la bande vibrationnelle (1000) de 12CF4. Ceci nous a permis d'affiner les constantes spectroscopiques de la molécule, notamment les valeurs (D1-D0) et (H1-H0). Nous avons aussi pu r2soudre pour la premi7re fois le spectre de la branche Q du sous-niveau A1 de la bande harmonique (0200). Nous avons fait une attribution complète des transitions rotationnelles jusqu'a J=40 et déterminé un premier lieu de constantes spectroscopiques relatives au sous-niveau A1 de la bande (0200).
Author: Xavier Audier
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Combining microscopy and spectroscopy, one can achieve spectrally resolved imaging, and provide a solution to various chemical, biological, or medical challenges. Coherent Raman scattering (CRS) has proven extremely valuable in providing chemical information, with a higher resolution and shorter acquisition time than spontaneous Raman scattering. The acquisition rate of the spectral information from a sample remains the limiting factor of CRS imaging, and several experimental schemes are being investigated to push the technology toward higher imaging frame rates. This work develops one such scheme. Combining stimulated Raman scattering (a CRS technique), spectral focusing with chirped pulses, and a fast acousto-optic delay line, we achieved unprecedented spectral acquisition rates. The theoretical, technological, and engineering frameworks enabling such acquisition are described in details. The application to pharmaceutical quality control, time resolved chemical transformations, biology, and histology are demonstrated.
Author: Dheeraj Kumar Singh
Publisher: Springer Nature
ISBN: 9819717035
Category :
Languages : en
Pages : 388
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Book Description
Author: Robert N. Compton
Publisher: Springer Nature
ISBN: 3030993957
Category : Science
Languages : en
Pages : 122
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Book Description
This book describes a simple yet innovative method for performing Raman spectroscopy of samples submerged under liquid nitrogen. While Raman spectroscopy has proven to be a powerful tool for the characterization of the structure of matter in the gaseous, liquid, and solid phases, one major difficulty in its application has been laser damage to the material under investigation, especially for biological samples. This book demonstrates how immersion of the sample in liquid nitrogen protects the sample from thermal degradation and oxidation at high incident laser power and allows improvements in sensitivity and spectral resolution over room-temperature Raman spectroscopy, leading to the so-called RUN (Raman Spectroscopy Under liquid Nitrogen) technique. Cooling to liquid nitrogen temperature also allows the selection of the lowest energy molecular conformation for molecules which may have many low energy conformers. In addition, the presence of liquid nitrogen over a roughened surface improves the sensitivity of Surface Enhanced Raman Spectroscopy (SERS), enabling the closely related SERSUN (Surface-Enhanced Raman Spectroscopy Under liquid Nitrogen) technique. This book starts with the theoretical and experimental basics of Raman and polarized Raman spectroscopy, before moving on to detailed descriptions of RUN and SERSUN. Room temperature and RUN spectra are provided for over fifty molecules.
Author: Wallace Raymond Lovett Clements
Publisher:
ISBN:
Category : Lasers
Languages : en
Pages : 90
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Book Description
Author: Slobodan Sasic
Publisher: John Wiley & Sons
ISBN: 1118058259
Category : Science
Languages : en
Pages : 572
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Book Description
An all-inclusive guide on the analytical methods of Raman, infrared, and near-infrared chemical imaging An underutilized technology, chemical imaging through Raman, infrared (IR), and near-infrared (NIR) is beginning to gain recognition for its non-destructive method of permitting visualization of spatially resolved chemical information. This type of analysis is triggering a groundswell of demand as manufactured materials become more complex and the need for greater scrutiny and less damaging research practices is at a premium. Concentrating on the applications of chemical imaging, this book presents a thorough background on the theory, software, and hardware employed in this analytical technique. With full examination of this rapidly growing field, this book: Combines many different aspects and applications into one comprehensive volume Discusses how chemical imaging techniques have expanded greatly in terms of instruments and applications, but have lagged in general awareness among scientists and industries that would benefit the most from them Describes chemical imaging uses in key areas—biomedical, pharmaceutical, food, and polymer research Has chapters that outline hardware and instrumentation for the different methods of chemical imaging Encapsulating analytic methods without complicating the subject matter, this book shows where chemical imaging has been successfully applied, inspiring researchers to cultivate the exciting capabilities rooted within this powerful and multifaceted technology.
Author: Rainer D. Beck
Publisher:
ISBN:
Category : Raman spectroscopy
Languages : en
Pages : 394
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Book Description
Author: Martin Quack
Publisher: John Wiley & Sons
ISBN: 0470066539
Category : Science
Languages : en
Pages : 2236
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Book Description
The field of High-Resolution Spectroscopy has been considerably extended and even redefined in some areas. Combining the knowledge of spectroscopy, laser technology, chemical computation, and experiments, Handbook of High-Resolution Spectroscopy provides a comprehensive survey of the whole field as it presents itself today, with emphasis on the recent developments. This essential handbook for advanced research students, graduate students, and researchers takes a systematic approach through the range of wavelengths and includes the latest advances in experiment and theory that will help and guide future applications. The first comprehensive survey in high-resolution molecular spectroscopy for over 15 years Brings together the knowledge of spectroscopy, laser technology, chemical computation and experiments Brings the reader up-to-date with the many advances that have been made in recent times Takes the reader through the range of wavelengths, covering all possible techniques such as Microwave Spectroscopy, Infrared Spectroscopy, Raman Spectroscopy, VIS, UV and VUV Combines theoretical, computational and experimental aspects Has numerous applications in a wide range of scientific domains Edited by two leaders in this field Provides an overview of rotational, vibration, electronic and photoelectron spectroscopy Volume 1 - Introduction: Fundamentals of Molecular Spectroscopy Volume 2 - High-Resolution Molecular Spectroscopy: Methods and Results Volume 3 - Special Methods & Applications
Author: John Romanko
Publisher:
ISBN:
Category :
Languages : en
Pages : 28
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Book Description
Author: Simonpietro Agnello
Publisher: John Wiley & Sons
ISBN: 1119697328
Category : Technology & Engineering
Languages : en
Pages : 500
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Book Description
SPECTROSCOPY FOR MATERIALS CHARACTERIZATION Learn foundational and advanced spectroscopy techniques from leading researchers in physics, chemistry, surface science, and nanoscience In Spectroscopy for Materials Characterization, accomplished researcher Simonpietro Agnello delivers a practical and accessible compilation of various spectroscopy techniques taught and used to today. The book offers a wide-ranging approach taught by leading researchers working in physics, chemistry, surface science, and nanoscience. It is ideal for both new students and advanced researchers studying and working with spectroscopy. Topics such as confocal and two photon spectroscopy, as well as infrared absorption and Raman and micro-Raman spectroscopy, are discussed, as are thermally stimulated luminescence and spectroscopic studies of radiation effects on optical materials. Each chapter includes a basic introduction to the theory necessary to understand a specific technique, details about the characteristic instrumental features and apparatuses used, including tips for the appropriate arrangement of a typical experiment, and a reproducible case study that shows the discussed techniques used in a real laboratory. Readers will benefit from the inclusion of: Complete and practical case studies at the conclusion of each chapter to highlight the concepts and techniques discussed in the material Citations of additional resources ideal for further study A thorough introduction to the basic aspects of radiation matter interaction in the visible-ultraviolet range and the fundamentals of absorption and emission A rigorous exploration of time resolved spectroscopy at the nanosecond and femtosecond intervals Perfect for Master and Ph.D. students and researchers in physics, chemistry, engineering, and biology, Spectroscopy for Materials Characterization will also earn a place in the libraries of materials science researchers and students seeking a one-stop reference to basic and advanced spectroscopy techniques.
