ADA * lb. RESTRICIVE MARKINGS. fluorescence detection luminescence detection, charge transfer devices, "'. -

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1 UNCLASSIFIED -,-( ri; ('(V.> 'ECURITY CLASSIFICATION OF THIS PA. - REPORT DOCUMENTATION PAGE lb. RESTRICIVE MARKINGS ADA * AD A DISTRIBUTION /AVAILABILITY OF REPORT &Z Approved for public release; S.iN I DOWNGRADING SCHEDULE distribution uni imi tee,' 4. PERFORMING ORGANIZATION REPORT NUMBER(S) S. MONITORING ORGANIZATION REPORT NUI NAME OF PERFORMING ORGANIZATION 6b. OFFICE SYMBOL 7a. NAME OF MONITORING ORGANIZATION" University of Arizona (f plicable) Office Ofe of.naval Researc er I a,- -cofal,z k. ADDRESS (Ci1y, State, Mid ZIP Code) 7b. ADDRESS (City, State, and ZIP Code). C,) Department of Chemistry " Tucson, Arizona Arlington, Virginia 2221 B. NAME OF FUNDING/SPONSORING 18b. OFFICE SYMBOL 9. PROCUREMENT INSTRUMENT IDENTIFICATION NUMBERbN0 ORGANIZATION (if applicablet) Off ice of Naval Research j N K c. ADDRESS (City, State, and ZIP Code) 10. SOURCE OF FUNDING NUMBERS 11. TITLE (include Security Cassification) "Molecular Spectroscopy Using Charge Transfer Device Detectors" PROGRAM PROJECT TASK WORK UNIT ELEMENT NO. NO. NO ACCESSION NO 12. PERSONAL AUTHOR(S) i J.V. Sweedler, P.M. Ep erson, R.D. Jalkian, and M.B. Denton. 13a. TYPE OF REPORT 113b. TIME COVERED 114.D~r OF REPORT (Year,Month,Day) S PAGE CUNT Technical IFROM 515,/.a TO February 4, mm 16. SUPPLEMENTARY NOTATION Prepared for presentation at the FACSS 14th Annual Meeting, Detroit, Michigan, October 4-9, COSATI CODES 18. SUBJECT Te S (Continue on reverie if necessary and identify by block number) FIEL GROUP SUB-GROUP Multichannel detectors, molecular spectroscopy, fluorescence detection luminescence detection, charge transfer devices, "' ABST (Continue on revern, if necessary and identify by block number) Recent advances in the capabilities of state-of-the-art array detectors have the potential to greatly-improve analytical spectroscopy. The operational characteristics of several charge transfer device (CTD) detectors investigated in our laboratories show them to be highly suitable for application in UV-Vis molecular spectroscopy. The electro-optical characteristics of these devices including dynamic range, quantum efficiency, noise, resistance to blooming and lag are contrasted to photodiode arrays, vidicons, and photomultiplier tubes. Wtih peak quantum efficiencies of 80%, read noises over two orders of magnitude lower than photodiode array detectors, and virtually no dark current, several of these CTD detectors are extremely well suited for luminescence spectroscopy. The performance of several spectroscopic systems which effectively use the various device geometries is presented. A linear concave grating spectrograph employing a 30-watt deuterium source and a CTD detector capable of extremely sensitive fluorescence measurements is described. Using this system, the detection limit for anthracene is =1xi0 "12 M -- (over)d 20. DISTRIBUTION IAVAILABILITY OF ABSTRACT 21. ABSTRACT SECURITY CLASSIFICATION WUNCASSIFIED/UNLIMITED 0 SAME AS RPT. 0 OTIC USERS UNCLASSIFIED 22a NAME OF RESPONSIBLE INDIVIDUAL 22b. TELEPHONE (include Area Code) 2c. OFFICE SYMBOL M. Bonner Denton (602) DO FORM MAR 83 APR edition may be used until exhausted. SECURITY CLASSIFICATION OF THIS PAGE All other editions are obsolete..unclassified U L %

2 19. Abstract (continued) e more sensitive than systems employing excimer laser sources and photon counting PMTs. In addition, the characteristics of several novel spectroscopic systems including a miniature gradient filter spectrograph and a common path holographic spectrometer employing charge transfer device detectors are presented. The theoretical and experimental performance of these molecular spectroscopic systems is discussed and compared to conventional s epnve systems. N,. 9 E U' 9-4 W4 a S1 _S PM S]

3 OFFICE OF NAVAL RESEARCH Contract N K-0316 R&T Code Technical Report No. 58 I? Molecular Spectroscopy Using Charge Transfer Device Detectors by ( '7 J.V. Sweedler, P.M. Epperson, R.D. Jalkian, and M.B. Denton Prepared for Presentation at the FACSS 14th Annual Meeting Detroit, Michigan ; October 4-9, 1987 Department of Chemistry - University of Arizona,. Tucson, Arizona February 4, 1988 Reproduction in whole or in part is permitted for any purpose of the United States Government. This document has been approved for public release and sale; its distribution is unlimited

4 MOLECULAR SPECTROSCOPY USING CHARGE TRANSFER DEVICE DETECTORS Jonathan V. Sweedler, Patrick M. Epperson, Rafi D. Jalkian, and M. Bonner Denton Department of Chemistry University of Arizona Tucson, Arizona Index Headings: Multichannel detectors, molecular spectroscopy, fluorescence detection, luminescence detection, charge transfer devices ABSTRACT Recent advances in the capabilities of state-of-the-art array detectors have the potential to greatly improve analytical spectroscopy. The operational characteristics of several, charge transfer device (CTD) detectors investigated in our laboratories show them to be highly suitable for application in UV-Vis molecular spectroscopy. The electro-optical characteristics of these devices including dynamic range, quantum efficiency, noise, resistance to blooming and lag are contrasted to photodiode arrays, vidicons, and photomultiplier tubes. With peak quantum h efficiencies of 80%, read noises over two orders of magnitude lower than photodiode array detectors, and virtually no dark current, several of these CTD detectors are extremely well suited for luminescence spectroscopy. The performance of several spectroscopic systems which effectively use the various device geometries is presented. A linear concave grating spectrograph employing a 30 watt dueterium source and a CTD detector capable of extremely sensitive fluorescence measurements is described. Using this system, the detection limit for anthracene is =ixl0 " 2 M-- more sensitive than systems employing excimer laser sources and photon counting PMTs. In addition, the characteristics of several novel spectroscopic systems including a miniature gradient filter spectrograph and a common path holographic spectrometer employing charge transfer device detectors are presented. The theoretical and experimental performance of these molecular spectroscopic systems is discussed and compared to conventional dispersive systemb. 0

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