Spectroscopy of the helium-4 isotope is a technique that investigates the atomic and molecular properties of this isotope by examining the emission and absorption spectrum of the helium-4 atom. Spectroscopy of the helium-4 isotope is usually performed in the gas phase and the absorption and emission properties of light at different wavelengths are examined. Spectroscopy of the helium-4 isotope is a technique used in fields such as atomic and molecular physics, gas spectroscopy, astrophysics and materials science. This technique provides an important tool for understanding the energy levels, chemical bonds, molecular structures and other properties of helium-4. Spectroscopy of the helium-4 isotope can have a variety of applications, including identification of atomic lines, analysis of molecular structures, spectral resolution improvement, and study of chemical reactions. This technique is used in both basic scientific research and industrial applications. Spectroscopy of the helium-4 isotope can be an important tool to better understand the isotope's physical and chemical properties and to study its behavior in different environments. This technique can be used to support a wide range of applications of helium-4.