Mgbe Agha Ụwa nke Abụọ tiwapụrụ, gọọmenti France zigara Rapkine na London na January 1940, n'ọrụ gọọmentị iji hụ na e nwetara coal maka ụlọ ọrụ mmepụta ihe na ndị agha France. Mgbe ọ nọ na England, o nyeere James Crowther aka n'ịmepụta Anglo-French Society of Sciences iji mee ka mmekọrịta sayensị dị n'etiti mba abụọ ahụ. Na June 1940, mgbe France chịliri aka elu nye Germany
, Rapkine kwadoro maka Society iji nyere ndị ọkà mmụta sayensị French aka ịchọta ebe mgbaba na United Kingdom, mana Society ahụ mebiri mgbe esemokwu dị n'etiti France na England kwụsịrị imekọ ihe ọnụ sayensị. Rapkine na Henri Laugier hapụrụ London iji gaa n'ihu mgbalị ha na United States.