With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: James McAvoy was nominated for a BAFTA.
text_B: A molecular beam is produced by allowing a gas at higher pressure to expand through a small orifice into a chamber at lower pressure to form a beam of particles -LRB- atoms , free radicals , molecules or ions -RRB- moving at approximately equal velocities , with very few collisions between the particles .. pressure. pressure. orifice. Calibrated orifice. velocities. velocities. Molecular beam is useful for fabricating thin films in molecular beam epitaxy and artificial structures such as quantum wells , quantum wires , and quantum dots .. molecular beam epitaxy. molecular beam epitaxy. Molecular beams have also been applied as crossed molecular beams .. The molecules in the molecular beam can be manipulated by electrical fields and magnetic fields .. Molecules can be decelerated in a Stark decelerator or in a Zeeman slower .. Stark decelerator. Stark decelerator. Zeeman slower. Zeeman slower
not_related.