A review of the spectroscopic tools needed to characterize AGNs is presented. This review focusses on ultraviolet, optical and infrared emission-line diagnostics specifically designed to help differentiate AGNs from starburst-dominated galaxies. The strengths and weaknesses of these methods are discussed in the context of on-going and future AGN surveys.

From the Magnetic Resonance Spectroscopy Unit, Department of Veterans Affairs Medical Center (Drs MacKay, Meyerhoff, and Weiner); Jacques Theron et Patrick Courtheam Centre Hospitalier Regional University, Pans, France (Dr Constans); and the Departments of Radiofogy (Drs Meyerhofl, Norman, and Weiner), Medicine (Dr Weiner), and Psychiatry (Drs MacKay, Fein, and Weiner), University of California...

Recent progress in the development of room temperature, continuous wave, widely tunable, mode-hop-free mid-infrared external cavity quantum cascade laser (EC-QCL) spectroscopic sources is reported. A single mode tuning range of 155 cm−1 (∼ 8% of the center wavelength) with a maximum power of 11.1 mW and 182 cm−1 (∼ 15% of the center wavelength) with a maximum power of 50 mW was obtained for 5.3...

In vivo monitoring of nanoparticle delivery is essential to better understand cellular and molecular interactions of nanoparticles with tissue and to better plan nanoparticle-mediated therapies. We developed a three-dimensional ultrasound and photoacoustic (PA) imaging system and a spectroscopic PA imaging algorithm to identify and quantify the presence of nanoparticles and other tissue constit...

A high-resolution human in vivo spectroscopic image was obtained using the 2.0-T NMR imaging system developed at KAIS (Korea Advanced Institute of Science). The in vivo spectroscopic image obtained has high spatial resolution as well as spectral resolution good enough for extraction of the detailed spectroscopic information. This high-resolution spectroscopic imaging was made possible by use of...

The dielectric functions of InP, IIla.53 Gao.47 As, and 1110.75 Gao.2S Aso.s P 0.5 epitaxial layers have been measured using a polarization-modulation spectroscopic ellipsometer in the 1.5 to 5.3 eV region. The oxide removal procedure has been carefully checked by comparing spectroscopic ellipsometry and x-ray photoelectron spectroscopy measurements. These reference data have been used to inves...

In conjugated polymers the concept of spectroscopic units belonging to different spatial segments of the chain, which are responsible for the spectroscopic properties of the polymer, has been used to explain the spectral heterogeneity and the excitation migration by (Förster type) hopping transfer. In the present work we study the possible mechanism of segmentation of polythiophene into spectro...

this study demonstrates the spectral data for two triarylmethane dyes, malachite green (mg) and crystal violet (cv) at room temperature. effects of micellar environment, and crown ether addition on the spectral behaviour of the dyes were studied using absorption spectroscopic method. the dye-anionic surfactant interactions in micellar media were investigated. the chosen surfactants with differe...