@article {8058,
	title = {Spontaneous relativistic two-photon decay rate mathematical expression in heliumlike systems},
	journal = {The European Physical Journal D},
	volume = {13},
	number = {1},
	year = {2001},
	note = {<p>JPS-Ref08</p>
},
	pages = {27-31},
	abstract = {<p>We derive a theoretical expression for the two-photon emission rate of two-electron systems, in a form suitable for easy implementation in numerical calculations. Racah algebra techniques were used to extended previous work on two-photon emission in hydrogen-like systems to more complex ones. The obtained expression is, as far as we are aware, the first general expression that gives the spontaneous two-photon decay rates of helium-like systems for any combination of multipoles.</p>
},
	url = {http://www.ed-phys.fr/articles/epjd/abs/2001/01/d0092/d0092.html},
	author = {J P Santos and P. Patt{\'e} and F. Parente and P. Indelicato}
}
