▁experimental ▁discovery ▁of ▁the ▁exc it on ▁( in ▁sem icon duct or ▁cry st als ▁of ▁cu pr ous ▁ox ide ) ▁through ▁evidence ▁of ▁its ▁hydro gen - like ▁optical ▁spectrum . ▁ ▁Category : 1 8 9 7 ▁birth s ▁Category : 1 9 7 2 ▁death s ▁Category : S ov iet ▁phys ic ists ▁Category : 2 0 th - century ▁phys ic ists ▁Category : Saint ▁Petersburg ▁State ▁University ▁al umn i <0x0A> </s> ▁Robert ▁Bour ne ▁may ▁refer ▁to : ▁ ▁Robert ▁Bour ne ▁( developer ) ▁( born ▁ 1 9 5 0 ), ▁British ▁property ▁developer ▁Robert ▁Bour ne ▁( polit ician ) ▁( 1 8 8 8 – 1 9 3 8 ), ▁British ▁ro wer ▁and ▁politician ▁Robert ▁Bour ne ▁( do ctor ) ▁( 1 7 6 1 – 1 8 2 9 ), ▁English ▁phys ician ▁and ▁professor ▁of ▁medicine ▁Robert ▁Bour ne ▁( football er ) ▁( born ▁ 1 9 9 8 ), ▁English ▁footballer ▁ ▁See ▁also ▁Bob ▁Bour ne ▁( born ▁ 1 9 5 4 ), ▁retired ▁professional ▁ice ▁hockey ▁left ▁wing <0x0A> </s> ▁Juan ▁Santa ▁María ▁Ál vare z ▁( Med ell ín , ▁ 1 5 ▁December ▁ 1 9 2 8 ▁- ▁ 2 8 ▁October ▁ 2 0 0 7 ) ▁was ▁a ▁Colomb ian ▁civil ▁engineer ▁and ▁phil atel ist ▁who ▁signed ▁the ▁Roll ▁of ▁Dist ingu ished ▁Phil atel ists ▁in ▁ 1 9 9 4 . ▁In ▁