0.1. Historical Background.- 0.2. Stages of Photoelectron Emission into Solution.- 0.3. General Features of Emission Phenomena in Electrochemical Systems.- 1. Fundamentals of the Theory of Photoelectron Emission from Metals into Solutions.- 1.1. Qualitative Description of the Phenomenon.- 1.2. The Threshold Approach to Photoemission.- 1.3. Calculation of the Photoemission Current.- 1.4. The 5/2 Power Law.- 1.5. The Effects of the Double Layer on the Photoemission.- 1.6. Dependence of the Photoemission Current on the Characteristics of the Irradiation.- 2. Theory of Photodiffusion Currents.- 2.1. Formulation of the Problem and Basic Relations.- 2.2. Stationary Photodiffusion Currents.- 2.3. Alternating Photodiffusion Currents.- 3. Experimental Techniques in Photoemission Studies.- 3.1. General Discussion of Photocurrent Measurements.- 3.2. Measuring Apparatus.- 3.3. Electrode Illumination.- 3.4. Electrochemical Cells.- 3.5. The Choice of Acceptors for Solvated Electrons.- 4. Photoelectron Emission in Solutions: Its Discovery, Kinetics, and Energetics.- 4.1. Introductory Notes.- 4.2. The Dependence of the Photoemission Current on the Electrode Potential and Quantum Energy. Experimental Verification of the 5/2 Power Law.- 4.3. The Effect of the Nature of the Metal on Photoemission and Electrochemical Kinetics.- 4.4. Energetics of Excess Electrons in Polar Solvents.- 4.5. The Effect of the Light Frequency and Polarization. Bulk andSurface Excitation of Electrons.- 4.6. Multiphoton Emission.- 5. Emitted Electrons in Solution: Subsequent Transformations.- 5.1. Dependence of the Photocurrent on Acceptor Concentration.- 5.2. Is There a Contribution of Dry Electrons to Photodiffusion Currents?.- 5.3. Characteristics of Retardation and Hydration of Photoelectrons.- 5.4. Slow Capture of Hydrated Electrons by the Metal Surface.- 5.5. Measurements of the Rate Constants of Electron Capture by Acceptors.- 5.6. Method of Competing Acceptors in Photoemission Studies.- 6. InvestigalU