Influence of Young-type interference on the forward-backward asymmetry in electron emission from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">H</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>in collisions with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>80</mml:mn><mml:mtext>−</mml:mtext><mml:mi>MeV</mml:mi></mml:mrow></mml:math>bare C ions

We use the forward-backward angular asymmetry in the electron emission cross sections in fast ion impact ionization of ${\mathrm{H}}_{2}$ as a probe of the inversion symmetric coherence in homonuclear diatomic molecules. The electron energy dependence of the asymmetry parameter for ${\mathrm{H}}_{2}$ exhibits oscillatory structure due to Young-type interference in contrast to atomic targets such as He. The asymmetry parameter technique provides a self-normalized method to reveal the interference oscillation independent of theoretical models and complementary measurements on atomic H target.