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- https://chem.libretexts.org/Courses/Oregon_Institute_of_Technology/OIT%3A_CHE_332_--_Organic_Chemistry_II_(Lund)/1%3A_Fall_term_review_sections/4%3A_Structure_Determination_I-_UV-Vis_and_Infrared_Spectroscopy_Mass_Spectrometry/4.2%3A_Mass_SpectrometryOur third and final analytical technique for discussion in this chapter does not fall under the definition of spectroscopy, as it does not involve the absorbance of light by a molecule. In mass spectr...Our third and final analytical technique for discussion in this chapter does not fall under the definition of spectroscopy, as it does not involve the absorbance of light by a molecule. In mass spectrometry (MS), we are interested in the mass - and therefore the molecular weight - of our compound of interest, and often the mass of fragments that are produced when the molecule is caused to break apart.
- https://chem.libretexts.org/Ancillary_Materials/Worksheets/Worksheets%3A_Analytical_Chemistry_II/Mass_Spectrometry%3A_Performance_Enhancing_DrugsBoth compounds are in the gas phase and ionized; each compound lost an electron resulting in two radical cations T+• and N+•. The gas phase ions are propelled towards the detector by applying a positi...Both compounds are in the gas phase and ionized; each compound lost an electron resulting in two radical cations T+• and N+•. The gas phase ions are propelled towards the detector by applying a positive charge to the electrode next to the injection port, causing the ions to be repelled (fly) towards the detector.
- https://chem.libretexts.org/Courses/Hope_College/CHEM_125/Exam_I/03%3A_The_Structure_of_Atoms/3.14%3A_Measurement_of_Atomic_Weightsand the ratio of masses may be obtained by measuring the ratio of radii, The paths of the ions are determined either by a photographic plate (which darkens where the ions strike it, as in Figure \(\Pa...and the ratio of masses may be obtained by measuring the ratio of radii, The paths of the ions are determined either by a photographic plate (which darkens where the ions strike it, as in Figure \PageIndex1) or a metal plate connected to a galvanometer (a device which detects the electric current due to the beam of charged ions). Since the distance from the entrance slit to the line on the photographic plate is twice the radius of the circular path of the ions, we have
- https://chem.libretexts.org/Courses/SUNY_Oneonta/Organic_Chemistry_with_a_Biological_Emphasis_(SUNY_Oneonta)/05%3A_Structure_Determination_II_-_Nuclear_Magnetic_Resonance_Spectroscopy/5.08%3A_Solving_Unknown_StructuresNow it is finally time to put together all that we have studied about structure determination techniques and learn how to actually solve the structure of an organic molecule 'from scratch' - starting,...Now it is finally time to put together all that we have studied about structure determination techniques and learn how to actually solve the structure of an organic molecule 'from scratch' - starting, in other words, with nothing but the raw experimental data.
- https://chem.libretexts.org/Courses/Oregon_Institute_of_Technology/OIT%3A_CHE_333_-_Organic_Chemistry_III_(Lund)/New_Page/5%3A_Structure_Determination_II_-_Nuclear_Magnetic_Resonance_Spectroscopy/5.7%3A_Solving_Unknown_StructuresNow it is finally time to put together all that we have studied about structure determination techniques and learn how to actually solve the structure of an organic molecule 'from scratch' - starting,...Now it is finally time to put together all that we have studied about structure determination techniques and learn how to actually solve the structure of an organic molecule 'from scratch' - starting, in other words, with nothing but the raw experimental data.
- https://chem.libretexts.org/Ancillary_Materials/Worksheets/Worksheets%3A_Analytical_Chemistry_II/GC-MS%3A_Performance_Enhancing_DrugsThe more atoms in the alkane, the greater the number of polarizable electrons, the greater the energy of interaction, consequently the higher the boiling point of the alkane. Ix is the Kovats retentio...The more atoms in the alkane, the greater the number of polarizable electrons, the greater the energy of interaction, consequently the higher the boiling point of the alkane. Ix is the Kovats retention index for the shorter of the two n-alkanes which bracket the analyte compound; the Kovats retention index number of n-alkanes is the number of carbons in the chain multiplied by one hundred (e.g.
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Instrumental_Analysis_(LibreTexts)/21%3A_Surface_Characterization_by_Spectroscopy_and_Microscopy/21.01%3A_Introduction_to_the_Study_of_SurfacesThus far we have considered methods for analyzing the bulk properties of samples, such as determining the identity or concentration of an ion in a solution, of a molecule in a gas, or of several eleme...Thus far we have considered methods for analyzing the bulk properties of samples, such as determining the identity or concentration of an ion in a solution, of a molecule in a gas, or of several elements in a solid. In do so, we did not concern ourselves with the sample's homogeneity or heterogeneity, which may vary along any of the x,y,z-axes. In this chapter we give consideration to the composition of a sample's surface.
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Analytical_Chemistry_2.1_(Harvey)/12%3A_Chromatographic_and_Electrophoretic_Methods/12.05%3A_High-Performance_Liquid_ChromatographyThis page discusses High-Performance Liquid Chromatography (HPLC), a method for separating compounds in a liquid solution. HPLC involves key components: reservoirs for the mobile phase, a pump, an inj...This page discusses High-Performance Liquid Chromatography (HPLC), a method for separating compounds in a liquid solution. HPLC involves key components: reservoirs for the mobile phase, a pump, an injector, columns (analytical and guard), and detectors. It explains different separation techniques (liquid-solid adsorption, liquid-liquid partitioning, etc.), types of columns (packed and capillary), stationary and mobile phases, and their interactions.
- https://chem.libretexts.org/Bookshelves/Organic_Chemistry/Book%3A_Organic_Chemistry_with_a_Biological_Emphasis_v2.0_(Soderberg)/04%3A_Structure_Determination_I-_UV-Vis_and_Infrared_Spectroscopy_Mass_SpectrometrySpectroscopy is the use of the absorption, emission, or scattering of electromagnetic radiation by atoms or molecules (or atomic or molecular ions) to qualitatively or quantitatively study the atoms o...Spectroscopy is the use of the absorption, emission, or scattering of electromagnetic radiation by atoms or molecules (or atomic or molecular ions) to qualitatively or quantitatively study the atoms or molecules, or to study physical processes. The interaction of radiation with matter can cause redirection of the radiation and/or transitions between the energy levels of the atoms or molecules.
- https://chem.libretexts.org/Courses/Oregon_Institute_of_Technology/OIT%3A_CHE_332_--_Organic_Chemistry_II_(Lund)/1%3A_Fall_term_review_sections/4%3A_Structure_Determination_I-_UV-Vis_and_Infrared_Spectroscopy_Mass_SpectrometrySpectroscopy is the use of the absorption, emission, or scattering of electromagnetic radiation by atoms or molecules (or atomic or molecular ions) to qualitatively or quantitatively study the atoms o...Spectroscopy is the use of the absorption, emission, or scattering of electromagnetic radiation by atoms or molecules (or atomic or molecular ions) to qualitatively or quantitatively study the atoms or molecules, or to study physical processes. The interaction of radiation with matter can cause redirection of the radiation and/or transitions between the energy levels of the atoms or molecules.
- https://chem.libretexts.org/Courses/Oregon_Institute_of_Technology/OIT%3A_CHE_333_-_Organic_Chemistry_III_(Lund)/New_Page/4%3A_Structure_Determination_I-_UV-Vis_and_Infrared_Spectroscopy_Mass_SpectrometrySpectroscopy is the use of the absorption, emission, or scattering of electromagnetic radiation by atoms or molecules (or atomic or molecular ions) to qualitatively or quantitatively study the atoms o...Spectroscopy is the use of the absorption, emission, or scattering of electromagnetic radiation by atoms or molecules (or atomic or molecular ions) to qualitatively or quantitatively study the atoms or molecules, or to study physical processes. The interaction of radiation with matter can cause redirection of the radiation and/or transitions between the energy levels of the atoms or molecules.
