Search
- https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Introductory_Chemistry_(CK-12)/05%3A_Electrons_in_Atoms/5.06%3A_Bohr's_Atomic_ModelThis page explores the analogy of climbing a ladder to explain potential energy and Niels Bohr's 1915 atomic model, where electrons occupy fixed energy states around the nucleus. It describes how elec...This page explores the analogy of climbing a ladder to explain potential energy and Niels Bohr's 1915 atomic model, where electrons occupy fixed energy states around the nucleus. It describes how electrons can gain or emit energy, often as light, when transitioning between these states. While effective for hydrogen, the model's limitations with other elements led to revisions in atomic theory.
- https://chem.libretexts.org/Courses/Los_Angeles_Trade_Technical_College/Analytical_Chemistry/2%3A_Analytical_Chemistry_2.0_(Harvey)/11%3A_Spectroscopic_Methods/11.07%3A_Atomic_Emission_SpectroscopyThe focus of this section is on the emission of ultraviolet and visible radiation following the thermal excitation of atoms. Atomic emission occurs when a valence electron in a higher energy atomic or...The focus of this section is on the emission of ultraviolet and visible radiation following the thermal excitation of atoms. Atomic emission occurs when a valence electron in a higher energy atomic orbital returns to a lower energy atomic orbital. The emission consists of a series of discrete lines at wavelengths corresponding to the difference in energy between two atomic orbitals.
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Instrumental_Analysis_(LibreTexts)/06%3A_An_Introduction_to_Spectrophotometric_Methods/6.04%3A_SpectraWhen an atom, ion, or molecule absorbs a photon it undergoes a transition from a lower-energy state to a higher-energy, or excited state, we obtain an absorbance spectrum. The result of the reverse pr...When an atom, ion, or molecule absorbs a photon it undergoes a transition from a lower-energy state to a higher-energy, or excited state, we obtain an absorbance spectrum. The result of the reverse process, in which an atom, ion, or molecule emits a photon as it moves from a higher-energy state to a lower energy state, is an emission spectrum. In this section we consider the characteristics of each.
- 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.
