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Lecture 29 Introduction to Fluorescence Spectroscopy

Lecture 29 Introduction to Fluorescence Spectroscopy When a molecule absorbs light, an electron is promoted to a higher excited state (generally a singlet state, but may also be a triplet state). The excited state can get depopulated in several ways. Introduction The molecule can lose its energy non radiatively by giving its energy to another absorbing species in its immediate vicinity (energy transfer) or by collisions with other species in the medium. If an excited state triplet overlaps with the exited state singlet, the molecule can cross over into this triplet state. This is known as inter system crossing. If the molecule then returns to the ground state singlet (T1 S0) by emitting light, the process is known as phosphorescence. The molecule can partially dissipate its energy by undergoing conformational changes and relaxed to the lowest vibrational level of the excited state in a process called vibrational relaxation.

Introduction to Fluorescence Spectroscopy . When a molecule absorbs light, an electron is promoted to a higher excited state (generally a singlet state, but may also be a triplet state). The excited state can get depopulated in several ways. Introduction

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Transcription of Lecture 29 Introduction to Fluorescence Spectroscopy

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