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- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Physical_Methods_in_Chemistry_and_Nano_Science_(Barron)/04%3A_Chemical_Speciation/4.05%3A_Photoluminescence_Phosphorescence_and_Fluorescence_SpectroscopyPhotoluminescence spectroscopy is a contactless, nondestructive method of probing the electronic structure of materials. Light is directed onto a sample, where it is absorbed and imparts excess energy...Photoluminescence spectroscopy is a contactless, nondestructive method of probing the electronic structure of materials. Light is directed onto a sample, where it is absorbed and imparts excess energy into the material in a process called photo-excitation. One way this excess energy can be dissipated by the sample is through the emission of light, or luminescence. In the case of photo-excitation, this luminescence is called photoluminescence.
- https://chem.libretexts.org/Courses/Los_Angeles_Trade_Technical_College/Analytical_Chemistry/2%3A_Analytical_Chemistry_2.0_(Harvey)/11%3A_Spectroscopic_Methods/11.05%3A_Emission_SpectroscopyAn analyte in an excited state possesses an energy that is greater than its energy when it is in a lower energy state. When the analyte returns to its lower energy state—a process we call relaxation. ...An analyte in an excited state possesses an energy that is greater than its energy when it is in a lower energy state. When the analyte returns to its lower energy state—a process we call relaxation. Relaxation of an analyte’s excited-state occurs through several mechanisms, including collisions with other species in the sample, by photochemical reactions, and by the emission of photons.
- https://chem.libretexts.org/Courses/Northern_Alberta_Institute_of_Technology/CHEM1130_Principles_in_Chemistry_I/4%3A_Chemical_Calculations/4.7%3A_Overview_of_SpectroscopyThe focus of this chapter is on the interaction of ultraviolet, visible, and infrared radiation with matter. Because these techniques use optical materials to disperse and focus the radiation, they of...The focus of this chapter is on the interaction of ultraviolet, visible, and infrared radiation with matter. Because these techniques use optical materials to disperse and focus the radiation, they often are identified as optical spectroscopies. For convenience we will use the simpler term spectroscopy in place of optical spectroscopy; however, you should understand that we are considering only a limited part of a much broader area of analytical techniques.
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Analytical_Chemistry_2.1_(Harvey)/10%3A_Spectroscopic_Methods/10.01%3A_Overview_of_SpectroscopyThis chapter explores the interaction of electromagnetic radiation with matter, particularly in the context of spectroscopy. It covers the principles of spectroscopy using ultraviolet, visible, and in...This chapter explores the interaction of electromagnetic radiation with matter, particularly in the context of spectroscopy. It covers the principles of spectroscopy using ultraviolet, visible, and infrared radiation. The chapter explains the wave and particle nature of electromagnetic radiation, highlighting its fundamental properties and explaining how matter absorbs or emits photons.
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Instrumental_Analysis_(LibreTexts)/15%3A_Molecular_Luminescence/15.05%3A_Evaluation_of_Molecular_LuminescenceA summary of the strengths and limitations of molecular luminescence.
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Analytical_Chemistry_2.1_(Harvey)/10%3A_Spectroscopic_Methods/10.06%3A_Photoluminescent_SpectroscopyThis page provides an in-depth explanation of photoluminescence, dividing it into two categories: fluorescence and phosphorescence. It describes the processes, mechanisms, and factors influencing both...This page provides an in-depth explanation of photoluminescence, dividing it into two categories: fluorescence and phosphorescence. It describes the processes, mechanisms, and factors influencing both types, including radiative and non-radiative deactivation pathways. The page discusses the technological advancements in fluorescence and phosphorescence spectroscopy, related instrumentation, and depicts their quantitative applications for analyzing inorganic and organic analytes.
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Analytical_Chemistry_2.1_(Harvey)/10%3A_Spectroscopic_Methods/10.11%3A_Chapter_Summary_and_Key_TermsThe chapter covers spectrophotometric techniques based on the absorption, emission, or scattering of electromagnetic radiation. It explains how molecules and atoms absorb radiation, causing changes in...The chapter covers spectrophotometric techniques based on the absorption, emission, or scattering of electromagnetic radiation. It explains how molecules and atoms absorb radiation, causing changes in energy states, and measures such as Beer???s law are used to relate absorbance to concentration. The chapter describes atomic absorption and emission methods, as well as scattering techniques like turbidimetry and nephelometry. Key terms related to spectroscopy methods and processes are included.
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Analytical_Chemistry_2.1_(Harvey)/10%3A_Spectroscopic_Methods/10.05%3A_Emission_SpectroscopyThis page discusses the concept of an analyte in an excited state and the processes of relaxation to its lower energy state. It elaborates on how excess energy is released in various ways, including a...This page discusses the concept of an analyte in an excited state and the processes of relaxation to its lower energy state. It elaborates on how excess energy is released in various ways, including as heat through vibrational relaxation, through photochemical reactions, or as a photon via electromagnetic radiation.
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Instrumental_Analysis_(LibreTexts)/01%3A_Introduction/1.02%3A_Types_of_Instrumental_MethodsIt is useful to organize instrumental methods of analysis into groups based on the chemical or physical properties that we use to generate a signal that we can measure and relate to the analyte of int...It is useful to organize instrumental methods of analysis into groups based on the chemical or physical properties that we use to generate a signal that we can measure and relate to the analyte of interest to us.
- https://chem.libretexts.org/Courses/Los_Angeles_Trade_Technical_College/Analytical_Chemistry/2%3A_Analytical_Chemistry_2.0_(Harvey)/11%3A_Spectroscopic_Methods/11.01%3A_Overview_of_SpectroscopyThe focus of this chapter is on the interaction of ultraviolet, visible, and infrared radiation with matter. Because these techniques use optical materials to disperse and focus the radiation, they of...The focus of this chapter is on the interaction of ultraviolet, visible, and infrared radiation with matter. Because these techniques use optical materials to disperse and focus the radiation, they often are identified as optical spectroscopies. For convenience we will use the simpler term spectroscopy in place of optical spectroscopy; however, you should understand that we are considering only a limited part of a much broader area of analytical techniques.
- https://chem.libretexts.org/Courses/Los_Angeles_Trade_Technical_College/Analytical_Chemistry/2%3A_Analytical_Chemistry_2.0_(Harvey)/11%3A_Spectroscopic_Methods/11.06%3A_Photoluminescence_SpectroscopyPhotoemission is divided into two categories: fluorescence and phosphorescence. Emission of a photon from the singlet excited state to the singlet ground state—or between any two levels with the same ...Photoemission is divided into two categories: fluorescence and phosphorescence. Emission of a photon from the singlet excited state to the singlet ground state—or between any two levels with the same spin—is called fluorescence. Emission between a triplet excited state and a singlet ground state—or between any two levels that differ in their respective spin states–is called phosphorescence. Both fluorescence and phosphorescence can be used for qualitative analysis and semi-quantitative analysis.
