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| 11 |  |  | \begin{document} | 
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| 13 |  |  | \signature{J. Daniel Gezelter} | 
| 14 |  |  |  | 
| 15 |  |  | \date{\today} | 
| 16 |  |  |  | 
| 17 |  |  | \begin{letter}{ | 
| 18 |  |  | Professor Toshiko Ichiye \\ | 
| 19 |  |  | McGowan Chair in Chemistry \\ | 
| 20 |  |  | Department of Chemistry \\ | 
| 21 |  |  | Georgetown University \\ | 
| 22 |  |  | 37th and O Streets NW \\ | 
| 23 |  |  | Washington, DC 20057-1227} | 
| 24 |  |  |  | 
| 25 |  |  | \opening{Dear Professor Ichiye:} | 
| 26 |  |  |  | 
| 27 |  |  | I am enclosing a manuscript titled ``{\bf On the structural and | 
| 28 |  |  | transport properties of the soft sticky dipole (SSD) and related | 
| 29 |  |  | single point water models}'' by Christopher J. Fennell and myself.  We | 
| 30 |  |  | are about to submit this manuscript for publication to {\it | 
| 31 |  |  | J. Chem. Phys.}, but since it directly relates to your work on the SSD | 
| 32 |  |  | model, I thought you should get a copy as soon as it was ready. | 
| 33 |  |  |  | 
| 34 |  |  | We started this work while picking a water model for use with a | 
| 35 |  |  | point-dipolar model for phospholipid headgroups in membrane | 
| 36 |  |  | simulations.  In this manuscript, we detail work we've done to | 
| 37 |  |  | reparameterize SSD in order to: | 
| 38 |  |  | \begin{enumerate} | 
| 39 |  |  | \item fix the densities while using SSD with the reaction field, | 
| 40 |  |  | \item match the Head-Gordon x-ray data on water, and | 
| 41 |  |  | \item keep the excellent transport behavior of the original SSD model. | 
| 42 |  |  | \end{enumerate} | 
| 43 |  |  | While we were doing our simulations to find good sets of parameters, | 
| 44 |  |  | we stumbled across an interesting crystal structure that seems to be | 
| 45 |  |  | the preferred crystal structure for the entire SSD family.  You'll | 
| 46 |  |  | find a picture of this structure in Fig. 12 in the manuscript. | 
| 47 |  |  |  | 
| 48 |  |  | Since your SSD model is an excellent choice for our membrane | 
| 49 |  |  | simulations, we've added it as the default water model in our parallel | 
| 50 |  |  | MD code.  If you'd like to use any of our code or would like to see | 
| 51 |  |  | any of the raw data that went into this manuscript please let us | 
| 52 |  |  | know.  I'd be happy to collaborate with you in any way. | 
| 53 |  |  |  | 
| 54 |  |  | If you have any questions or comments, I can be reached via email at: | 
| 55 |  |  | gezelter@nd.edu, or by phone at (574) 631-7595. | 
| 56 |  |  |  | 
| 57 |  |  | \closing{Best regards,} | 
| 58 |  |  | \end{letter} | 
| 59 |  |  | \end{document} | 
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