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Single-Particle Electrodynamics - Assassination Science

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− rd<br />

−2 r2 s (n s· ˙v)(n s·¨v)( ˙v·σ)σ<br />

− 6rd<br />

−2 r2 s (n d· ˙v)(n d·σ)(n d· ˙σ)(n s· ˙v) 2 n d<br />

+ 7 2 r−2 d r2 s (n d· ˙v)(n d·σ)(n s· ˙v)(n s·¨v)σ<br />

− 10rd<br />

−2 r2 s (n d· ˙v)(n d·σ) 2 (n s· ˙v)(n s·¨v)n d<br />

+ 7 2 r−2 d r2 s (n d·σ)(n s· ˙v)(n s·¨v)( ˙v·σ)n d + O(ε),<br />

λ(σ·∇)B q 1 = r −2<br />

d<br />

− r −1<br />

d<br />

˙v×σ + 2r −2<br />

d<br />

(n d· ˙v) ˙v×σ − r −1<br />

(n d·σ)n d × ˙v − r −1 ¨v×σ<br />

d<br />

d<br />

(n d·σ)n d רv + 2rd<br />

−1 ( ˙v·σ)n d× ˙v<br />

− 2rd −1 (n d· ˙v)(n d·σ)n d × ˙v + 1 ...<br />

v×σ + 5 2 4 ˙v2 ˙v×σ<br />

+ 1 2 (n d· ˙v) 2 ˙v×σ − 3(n d· ˙v)( ˙v·σ)n d × ˙v<br />

+ (n d· ˙v) 2 (n d·σ)n d × ˙v + O(ε),<br />

λ(σ·∇)B q 2 = −r −2<br />

d<br />

+ r −1<br />

d<br />

˙v×σ − 2r −2<br />

d<br />

(n d· ˙v) ˙v×σ + 1 2 r−1<br />

(n d·σ)n d × ˙v + 1 2 r−1 d ¨v×σ<br />

d<br />

(n d·σ)n d רv − 2rd<br />

−1 ( ˙v·σ)n d× ˙v<br />

+ 2rd −1 (n d· ˙v)(n d·σ)n d × ˙v − 1 ...<br />

v×σ − 1 6 4 ˙v2 ˙v×σ<br />

− 1 2 (n d· ˙v) 2 ˙v×σ + 3(n d· ˙v)( ˙v·σ)n d × ˙v<br />

− (n d· ˙v) 2 (n d·σ)n d × ˙v + O(ε).<br />

Adding these results together, we find<br />

4πλ(σ·∇)E q<br />

= r −3<br />

d<br />

σ − 3r−3(n<br />

d·σ)n d + 1 2 r−2<br />

d<br />

d<br />

(n d·σ) ˙v − 1 2 r−2 d ( ˙v·σ)n d<br />

+ 1 2 r−3 d<br />

r s(n s· ˙v)σ − 3 2 r−3r<br />

s(n d·σ)(n s· ˙v)n d − 3 8 r−1 ˙v 2 σ<br />

536<br />

d<br />

d

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