Help. WAVELENGTHS IN ABSORPTION/EMISSION SPECTRUM Can anyone help me obtain the following information? Or to direct me to any textbooks /publications that can help? Its for my brother who is researching that area. 1) ALL WAVELENGTHS IN THE ABSORPTION SPECTRUM OF "HYDROGEN" IN THE LYMAN, BALMER, PASCHEN, BRACKET AND PFUND SERIES. 2) ALL WAVELENGTHS IN THE EMISSION SPECTRUM OF "HYDROGEN" IN THE LYMAN, BALMER, PASCHEN, BRACKET AND PFUND SERIES. 3) ALL WAVELENGTHS IN THE ABSORPTION AS WELL AS THE EMISSION SPECTRUM OF "POTASSIUM", "SODIUM" AND "IRON". N.B.There is a need to ensure that DATA for Absorption is separate from Emission so that one CLEARLY knows which is which. Also that the Wavelengths' Units of Measurement (whether Meters, Nanometers, Picometers, Angstroms etc) is clearly indicated.