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Results are presented for [CII] 158 micron line fluxes observed with theHerschel PACS instrument in 112 sources with both starburst and AGNclassifications, of which 102 sources have confident detections. Results arecompared with mid-infrared spectra from the Spitzer Infrared Spectrometer andwith L(IR) from IRAS fluxes; AGN/starburst classifications are determined fromequivalent width of the 6.2 micron PAH feature. It is found that the [CII] lineflux correlates closely with the flux of the 11.3 micron PAH featureindependent of AGN/starburst classification, log [f([CII] 158 micron)/f(11.3micron PAH)] = -0.22 +- 0.25. It is concluded that [CII] line flux measures thephotodissociation region associated with starbursts in the same fashion as thePAH feature. A calibration of star formation rate for the starburst componentin any source having [CII] is derived comparing [CII] luminosity L([CII]) toL(IR) with the result that log SFR = log L([CII)]) - 7.08 +- 0.3, for SFR insolar masses per year and L([CII]) in solar luminosities. The decreasing ratioof L([CII]) to L(IR) in more luminous sources (the "[CII] deficit") is shown tobe a consequence of the dominant contribution to L(IR) arising from a luminousAGN component because the sources with largest L(IR) and smallestL([CII])/L(IR) are AGN.

[CII] 158 micron Luminosities and Star Formation Rate in Dusty Starbursts and AGN