H F—H-F

\F-H—F H

\

∆=19.7GHz .66cm-1

H 0 1 F—H--F

F--H—F 1 0 H

∆ = 6.5GHz .22cm-1MHz

H 1 0 F—H--FMHz

Ground State

<—>

(HF)2 Ground State Tunneling

(0,0 L) (0, 0 R)

(0,0 L) 0

(0, 0 R) -.33

0

H F—H-F

H F-H—F\ /

(1,0L) (0,1L) (1,0R) (0,1R)(1,0L) E ) λ (,L) λ E ) (,R) E ) λ(,R) λ E )

H 0 1 F—H F

H 1 0 F—H F

1 HF H—F 0

0 HF H—F 1

29.4 0

-29.4 0

0 29.4

0 -29.4

Conclusions

Free HF stretch and bonded HF stretch are mixed

∆ = .2cm-1 Tunnel Frequency

Free = 1/30 Bonded Predissociation Linewidth

H 1 1 F——H-- F

1F--H——F 1 H

∆∆ ≈ 20 GHz

H 0 0 F——H- F

0F-H——F 0 H

∆∆ ≈ 19.7 GHz

M. Quack et al