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. 2022 Jul 21;2(8):1839–1847. doi: 10.1021/jacsau.2c00156

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© 2022 The Authors. Published by American Chemical Society

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(Space quantized) O₂ sticking probabilities on Cu(110). (a) Angular distributions (upper panel) of the molecular axis (O–O bond axis) of an O₂ (in the triplet electronic ground state ³Σ_g^– and spin-rotational state (J = 2, M = 2)) with respect to Cu(110) (schematically depicted in the lower panel) and corresponding defining magnetic fields . Orienting perpendicular to the surface, i.e., along [1̅ 1̅0], results in helicopter-like rotating O₂. Two types of cartwheel-like rotating O₂ can also be realized by orientating parallel to the surface, i.e., either along [1̅10] or [001]. (b) Time evolution of the sticking probability for a space-quantized O₂ impinging on Cu(110) (at a surface temperature of ca. 310 K) with translational energy E_t = 0.10 eV. Time t = 0 corresponds to the time the beam shutter is opened to allow the molecular beam to impinge on the surface. Following the control signal shown (topmost right panel), the direction can be modulated to alternately produce helicopter-like (high signal) and cartwheel-like (low signal) rotating O₂ that impinge on Cu(110). Numerical fits to the corresponding sticking probability data points (using exponentially decaying functions extrapolated to t = 0) also shown to guide the eye. The values at t = 0 correspond to the initial sticking probabilities S₀(H), S₀(C_x), and S₀(C_y).

Inline graphic — (Space quantized) O₂ sticking probabilities on Cu(110). (a) Angular distributions (upper panel) of the molecular axis (O–O bond axis) of an O₂ (in the triplet electronic ground state ³Σ_g^– and spin-rotational state (J = 2, M = 2)) with respect to Cu(110) (schematically depicted in the lower panel) and corresponding defining magnetic fields . Orienting perpendicular to the surface, i.e., along [1̅ 1̅0], results in helicopter-like rotating O₂. Two types of cartwheel-like rotating O₂ can also be realized by orientating parallel to the surface, i.e., either along [1̅10] or [001]. (b) Time evolution of the sticking probability for a space-quantized O₂ impinging on Cu(110) (at a surface temperature of ca. 310 K) with translational energy E_t = 0.10 eV. Time t = 0 corresponds to the time the beam shutter is opened to allow the molecular beam to impinge on the surface. Following the control signal shown (topmost right panel), the direction can be modulated to alternately produce helicopter-like (high signal) and cartwheel-like (low signal) rotating O₂ that impinge on Cu(110). Numerical fits to the corresponding sticking probability data points (using exponentially decaying functions extrapolated to t = 0) also shown to guide the eye. The values at t = 0 correspond to the initial sticking probabilities S₀(H), S₀(C_x), and S₀(C_y).