Topic
Spectroscopy
About: Spectroscopy is a research topic. Over the lifetime, 71355 publications have been published within this topic receiving 1532141 citations. The topic is also known as: spectrum analysis & spectral analysis.
Papers published on a yearly basis
1 / 3
Papers
TL;DR: In this article, surface-enhanced Raman scattering was used to detect single molecules and single nanoparticles at room temperature with the use of surface enhanced Raman, and the intrinsic Raman enhancement factors were on the order of 10 14 to 10 15, much larger than the ensemble-averaged values derived from conventional measurements.
Abstract: Optical detection and spectroscopy of single molecules and single nanoparticles have been achieved at room temperature with the use of surface-enhanced Raman scattering. Individual silver colloidal nanoparticles were screened from a large heterogeneous population for special size-dependent properties and were then used to amplify the spectroscopic signatures of adsorbed molecules. For single rhodamine 6G molecules adsorbed on the selected nanoparticles, the intrinsic Raman enhancement factors were on the order of 10 14 to 10 15 , much larger than the ensemble-averaged values derived from conventional measurements. This enormous enhancement leads to vibrational Raman signals that are more intense and more stable than single-molecule fluorescence.
10,469 citations
Book•
15 Jan 1995
TL;DR: In this article, the authors present a simulation of the optical response functions of a multilevel system with relaxation in a multimode Brownian Oscillator Model and a wavepacket analysis of nonimpulsive measurements.
Abstract: 1. Introduction 2. Quantum Dynamics in Hilbert Space 3. The Density Operator and Quantum Dynamics in Liouville Space 4. Quantum Electrodynamics, Optical Polarization, and Nonlinear Spectroscopy 5. Nonlinear Response Functions and Optical Susceptibilities 6. The Optical Response Functions of a Multilevel System with Relaxation 7. Semiclassical Simulation of the Optical Response Functions 8. The Cumulant Expansion and the Multimode Brownian Oscillator Model 9. Fluorescence, Spontaneous-Raman and Coherent-Raman Spectroscopy 10. Selective Elimination of Inhomogeneous Broadening Photon Echoes 11. Resonant Gratings, Pump-Probe, and Hole Burning Spectroscopy 12. Wavepacket Dynamics in Liouville Space The Wigner Representation 13. Wavepacket Analysis of Nonimpulsive Measurements 14. Off-Resonance Raman Scattering 15. Polarization Spectroscopy Birefringence and Dichroism 16. Nonlinear Response of Molecular Assemblies The Local-Field Approximation 17. Many Body and Cooperative Effects in the Nonlinear Response
5,469 citations
Book•
1 Jan 1971
TL;DR: In this article, the authors present an overview of the main components of optical atomic spectrometers and their application in the field of surface characterization by Spectroscopy and Microscopy.
Abstract: Introduction. Section I: Measurement Basics. Electrical Components and Circuits. Operational Amplifiers in Chemical Instrumentation. Digital Electronics and Microcomputers. Signals and Noise. Section II: Atomic Spectroscopy. An Introduction to Spectrometric Methods. Components of Optical Instruments. An Introduction to Optical Atomic Spectrometry. Atomic Absorption and Atomic Fluorescence Spectrometry. Atomic Emission Spectrometry. Atomic Mass Spectrometry. Atomic X-Ray Spectrometry. Section III: Molecular Spectroscopy. An Introduction to Ultraviolet/Visible Molecular Absorption Spectrometry. Applications of Ultraviolet/Visible Molecular Absorption Spectrometry. Molecular Luminescence Spectrometry. An Introduction to Infrared Spectrometry Applications of Infrared Spectrometry. Raman Spectroscopy. Nuclear Magnetic Resonance Spectroscopy. Molecular Mass Spectrometry. Surface Characterisation by Spectroscopy and Microscopy. Section IV: Electroanalytical Chemistry. Introduction to Electroanalytical Chemistry. Potentiometry. Coulometry. Voltammetry. Section V: Separation Methods. An Introduction to Chromatographic Separations. Gas Chromatography. High-Performance Liquid Chromatography. Supercritical Fluid Chromatography and Extraction. Capillary Electrophoresis and Capillary Electrochromatography. Section VI: Miscellaneous Methods. Thermal Methods. Radiochemical Methods. Automated Methods of Analysis. Appendices.
4,801 citations
TL;DR: In this paper, a synthesis of highly luminescent (CdSe)ZnS composite quantum dots with CdSe cores ranging in diameter from 23 to 55 A was reported.
Abstract: We report a synthesis of highly luminescent (CdSe)ZnS composite quantum dots with CdSe cores ranging in diameter from 23 to 55 A. The narrow photoluminescence (fwhm ≤ 40 nm) from these composite dots spans most of the visible spectrum from blue through red with quantum yields of 30−50% at room temperature. We characterize these materials using a range of optical and structural techniques. Optical absorption and photoluminescence spectroscopies probe the effect of ZnS passivation on the electronic structure of the dots. We use a combination of wavelength dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, small and wide angle X-ray scattering, and transmission electron microscopy to analyze the composite dots and determine their chemical composition, average size, size distribution, shape, and internal structure. Using a simple effective mass theory, we model the energy shift for the first excited state for (CdSe)ZnS and (CdSe)CdS dots with varying shell thickness. Finally, we characterize the...
4,598 citations
TL;DR: In this article, the authors verified the remarkable sensitivity of Raman spectroscopy for the study of adsorbed pyridine on a silver surface, and extended its applicability to other nitrogen heterocycles and amines.
4,540 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2026 | 5,833 |
| 2025 | 3,368 |
| 2024 | 5,475 |
| 2023 | 5,116 |
| 2022 | 10,531 |
| 2021 | 2,800 |