Submitted on: 15 November 2006.
Revised on: 06 December 2006.
Accepted on: 15 January 2007.
___________________ACS Photonics---AMER CHEMICAL SOC
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Submitted on: 28 October 1998.
Revised on: 07 January 1999.
Accepted on: 08 February 1999.
___________________ACS Photonics---AMER CHEMICAL SOC
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Submitted on: 04 November 2008.
Revised on: 07 February 2009.
Accepted on: 01 April 2009.
___________________ACS Photonics---AMER CHEMICAL SOC
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