For beginners and specialists in other fields: the Nobel Laureate's widely admired introduction to atomic spectra and their relationship to atomic structures, stressing basic principles. The treatment is physical, rather than mathematical, with experiment serving as the starting point for theory. 80 illustrations.
GT Barnes & Noble, 2009-01-23. Holy crap, what an awesome little book! Truly a perfect text (and only $13.95, god bless the good folk at Dover Math Publications)! Why this isn't issued to every incoming freshman at technological universities (along with a few other select treatises like Schrödinger's What is Life?, A Mathematician's Apology and maybe Primo Levi's The Periodic Table) is beyond me -- it presents in a little over 200 pages a comprehensive, beautifully-united, rigorous coverage of nuclear theory. I offer it my highest praise: Had I have had this book 10 years ago, I'd be much smarter today, have understood much more and made finer, broader, more exquisite syntheses. Alas! Make much of time!
This book is NOT current but it is quite important to gain perspective in the development astronomical spectroscopy. Perhaps the most important part of this work is that a number of formula are derived.