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• W3165885659 abstract "We show that the cross sections for a broad range of resonant {it inelastic} processes accompanied by excitation exchange (such as spin-exchange, Forster resonant, or angular momentum exchange) exhibit an unconventional near-threshold scaling $E^{Delta m_{12}}$, where $E$ is the collision energy, $Delta m_{12}=m_1'+m_2'-m_1-m_2$, and $m_i$ and $m_i'$ are the initial and final angular momentum projections of the colliding species ($i=1,,2$). In particular, the inelastic cross sections for $Delta m_{12}=0$ transitions display an unconventional $E^0$ scaling similar to that of elastic cross sections, and their rates vanish as $T^{Delta m_{12}+1/2}$. For collisions dominated by even partial waves (such as those of identical bosons in the same internal state) the scaling is modified to $sigma_text{inel}propto E^{Delta m_{12} +1} $ if $Delta m_{12}$ is odd. We present accurate quantum scattering calculations that illustrate these modified threshold laws for resonant spin exchange in ultracold Rb+Rb and O$_2$+O$_2$ collisions. Our results illustrate that the threshold scaling of collision cross sections is determined only by the energetics of the underlying process (resonant vs. exothermic) rather than by whether the internal states of colliding particles is changed in the collision." @default.
• W3165885659 created "2021-06-07" @default.
• W3165885659 creator A5008489114 @default.
• W3165885659 creator A5061216131 @default.
• W3165885659 creator A5081725229 @default.
• W3165885659 creator A5083658181 @default.
• W3165885659 date "2022-01-14" @default.
• W3165885659 modified "2023-09-26" @default.
• W3165885659 title "Near-threshold scaling of resonant inelastic collisions at ultralow temperatures" @default.
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• W3165885659 doi "https://doi.org/10.1103/physreva.105.l011302" @default.
• W3165885659 hasPublicationYear "2022" @default.
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