Powder Diffraction SIG Officers

Past Chair, Ashia Huq Neutron Scattering Science Div Spallation Neutron Source Oak Ridge National Lab PO Box 2008 MS 6475 Oak Ridge TN 37831 Tel: 865 574 7923 huqa@ornl.gov

Annual Reports

Annual reports contain information on the activities of the SIG for the year, issues addressed by the SIG members, future activity planning and any changes to the operations or constitution of the SIG.

2009 Report Download

2008 Report  Download

2006 Report  Download

2005 Report  Download

Constitution

I. Name

The name of this organization shall be the Scientific Interest Group on Structure Determination from Powder Data of the American Crystallographic Association.

II. Purpose

The purpose of this Group of the American Crystallographic Association (hereafter ACA) is to further the advancement of all aspects of powder diffraction aimed towards structure solutions and refinement based upon X-ray and neutron powder data and to promote communication between persons interested in such techniques and results.

III. Relationship to the American Crystallographic Association

The constitution of this group shall be consistent with the Constitution, By-laws, and Operating Rules of the ACA. In the event of conflict the Constitution, By-law and Rules of the ACA shall prevail.

IV. Membership

Membership in this group is open to all members of the ACA on application to the Secretary-Treasurer of this Scientific Interest Group and payment of the prescribed dues, if any.

V. Organization

The activities of this Group shall be administered by an Executive Committee of three officers elected by members of the Group. The officers of the Executive Committee shall be Chairperson, Chairperson-Elect and Past-Chairperson. It shall be the duty of the Chairperson to arrange, in cooperation with the ACA Program Chairperson, the Scientific Interest Sessions on Structure Determination from Powder Data for ACA meetings. The Chairperson-Elect shall serve in a special advisory capacity to the Chairperson and shall act in his capacity if for any reason the Chairperson cannot act. The Chairperson-Elect shall also serve to represent the Group to the Council of the Association and to be the Group's representative on the Program Committee of ACA meetings. Whenever possible, all notices to the Group shall be circulated along with the Newsletter of the ACA.

The term of office for each officer shall begin on the calendar year immediately following election. The Chairperson-Elect automatically succeeds to the Chairpersonship after one year. The Chairperson succeeds to Past-Chairperson after one year. Thus, a Chairperson-Elect is elected each year. Vacant, unexpired terms are filled by appointment by the Executive Committee.

The Executive Committee shall appoint a Nominating committee of three members, none of whom may be on the Executive Committee, to nominate candidates for election. The Nominating Committee shall be appointed by March 31st of each year and shall report its nominate to the Executive Committee by July 31st following. Other candidates may be nominated from the membership by petitions signed by five or more members. No persons may be regularly elected to any office of the Executive committee for more than two consecutive terms. Elections shall take place at the same time as do ACA elections.

VI. Activities

The Executive Committee and Group may engage in any activities consistent with the ACA Constitution, By-law, and Operating Rules, which in its opinion further the purposes of the Group. These activities include, but not restricted to, organizing a Structure Determination from Powder Data half-day session, in cooperation with ACA Program Chairman, at least once every two years at an ACA meetings.

VII. Elections and Voting

All votes shall be by mail ballot. Votes shall be by simple majority of those voting, except for votes on amendments to the Constitution (see IX.).

VIII. Dues

The Executive Committee may set dues to be charged to members of the group subject to an affirmative vote of the membership and to approval by the ACA Council. Such dues shall be collected and disbursed by the ACA Treasurer.

IX. Amendments

An amendment to the constitution may be proposed at any time by a petition signed by 5 % membership or 7 members, whichever is smaller, or by the Executive Committee. Amendments must be ratified by 2/3 majority of the members voting. Votes shall be by mail ballot