A new multiple π-pulse sequence in solid-state NMR

1 December 1995

CHEMICAL PHYSICS LETTERS ELSEVIER

Chemical Physics Letters 246 (1995) 527-528

Erratum

A new multiple w-pulse sequence in solid-state NMR (Chem. Phys. Letters 241 (1995) 79) " Y. Li, J.N.S. Evans Received 19 September 1995

There was an error that lead to the incorrect phase list being depicted in Table 1 of our Letter reporting a new supercycle. The correct phase list is included in the revised Table 1 shown below, in which the full 256-step cycle is shown in order to reduce confusion.

Table 1 The supercycle phase list

xrx~xrx

xvxr,'xrx

Yocrxrrxr

xxrxrrxv

~ F ~

xrxrrxrx

xxrxvrxv

Focvxt'vxr

xrxn,xrx

x~'xrYxrX

xxrxvYxr

Y~xvx~,,xv

xrxrrxrx

xrx'rYXrX

Yocrxn,xv

xxrxwxr

xrxrrxvx

xrxvvxrx

xxrxvYxY

Yocrxrvxv

xrxYrxvx

x,,'xvvxvx

Y.xrxrrxr

xxrxrrxr

xrxyvxvx

xvxrrxrx

~rxn'x'r

XXYXYYXY

XYXYYXYX

XYXYYXYX

XXYXYYXY

~rx'rrx'y

Table 2 Logic of Li and Evans supercycle construction

R= XY-8; Q= RR= XY-16 define: Q' = permutedQ = ~(XYXYYXYXXYXYYXY supercycle: QQ'[ QQ' ]- I{QQ,[ QQ, ]- i }- I[QQ,[ QQ, ]- I{QO,[ QQ, ]- i}- i ]- l

~' SSDI of original article: 0009-2614(95)00588-9. 0009-2614/95/$09.50 © 1995 Elsevier Science B.V. All rights reserved SSDI 0 0 0 9 - 2 6 1 4 ( 9 5 ) 0 1 2 1 6 - 8

528

Y. Li, J.N.S. Evans/Chemical Physics Letters 246 (1995) 527-528

Table 3 Logic of XY supercycle construction XY-32: QQ' XY-64: QQ'[QQ']- l XY-128: QQ'[QQ']- I{QQ,[QQ,]- ~}, XY-256: QQ'[QQ']-I{QQ,[QQ,]-I},[QQ,[QQ,]-J{QQ,[QQ,]-l},]-

i

The logic employed in the construction of the supercycle is illustrated in Table 2. It is evident that this supercycle is not related to higher-order expansions of the XY phase cycles, as shown in Table 3. We regret any confusion that this error may have caused, and are particularly grateful to T. Gullion to alerting us to it.