Subject: G2 AND CBS METHODS: CONVERGENCE FAILURES

From: "E. Lewars" <[email-masked]>
Date: Sun, 14 Mar 1999 11:49:46 -0500 (EST)

1999 March 14

Hello,

I find that the high-accuracy G2-type (G2, G2MP2 etc) and CBS (CBS-4,
CBS-Q) methods, as implemented in Gaussian 94 and Gaussian 98, useful as they
are, fairly frequently fail because of convergence problems. G92MP2 fails in
step 5, and CBS-Q and CBS-4 in step 4, that is, after wasting hours on several
previous steps.

If others have had this problem with G2 and CBS methods and found a solution,
I would very much appreciate hearing what it is.

  Thank you.
    E. Lewars
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