WorldCat Identities

Magde, Douglas

Overview
Works: 5 works in 5 publications in 1 language and 5 library holdings
Publication Timeline
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Most widely held works by Douglas Magde
Q-Switching and Mode-Locking the Nd(3+)-Glass Laser with the Nickel Dithienes( Book )

1 edition published in 1974 in English and held by 1 WorldCat member library worldwide

The compound bis-(4-dimethylaminodithiobenzil)-nickel (BDN) was shown to be a photochemically stable saturable absorber suitable as a Q-switch for Nd3+-glass lasers
Picosecond Internal Conversion in Crystal Violet( Book )

1 edition published in 1973 in English and held by 1 WorldCat member library worldwide

On the basis of measurements made using the second harmonic of a mode-locked Nd(3+) laser, the authors demonstrate that the efficient quenching of the lowest excited singlet state in the dye, crystal violet involves rapid repopulation of the ground state in less than 10 to the -11th power sec. The repopulation time exhibits a cube root dependence on solvent viscosity. They argue that the data are best explained by a deactivation involving direct S(1) to S(0) internal conversion. They suggest that the class of triphenyl and diphenylmethane dyes should prove to be more efficient and versatile bleachable shutters and passive mode-locking elements for laser construction than any dyes currently in use in the visible region of the spectrum. (Modified author abstract)
Picosecond Flash Photolysis and Spectroscopy: 3,3'-Diethyloxadicarbocyanine Iodide (DODCI)( Book )

1 edition published in 1974 in English and held by 1 WorldCat member library worldwide

The authors demonstrate transient absorption spectroscopy with picosecond time resolution and nanometer spectral resolution over the entire visible region. To resolve multiple discrepancies in the literature, they studied 3,3'-diethyloxadicarbocyanine iodide, measuring both excited singlet lifetime and ground state depletion and recovery. The kinetics of the two processes are the same. They report fluorescence yield determinations and comment on the controversy over photoisomer generation. (Modified author abstract)
Picosecond Flash Photolysis and Spectroscopy: Bis-(4-Dimethylaminodithiobenzel)-Ni(II), (BDN)( Book )

1 edition published in 1974 in English and held by 1 WorldCat member library worldwide

The transient absorption spectrum of an electronically excited dithiene, bis-(4-dimethylaminodithiobenzil)-Ni(II), BDN, was measured with 10 ps temporal resolution and 1 nm wavelength resolution. For a series of 'heavy atom' solvents, both the ground state and the excited state spectra remained constant while the decay kinetics of the excited state absorption, as well as the recovery from ground state bleaching, varied. The excited state spectrum can plausibly be fit by a particular one electron transition between previously calculated molecular orbitals, although this clearly does not prove that these orbitals provide the best description for the excited states. The authors comment on three possibilities within the framework of the ground state virtual orbital picture. The recently developed techniques will be generally applicable in probing the photodynamics of presently intractable molecular species. The significance of the data for laser mode-locking is discussed. (Modified author abstract)
Picosecond Flash Photolysis: Transient Absorption in Sn(IV), Pd(II), and Cu(II) Porphyrins( Book )

1 edition published in 1974 in English and held by 1 WorldCat member library worldwide

From picosecond flash photolysis and spectroscopy, the absorption spectra of the first excited singlet S(1) and of the first excited triplet T(1) of (OEP)SnCl2 (Octaethylporphinatotin dichloride) are determined. The triplet quantum yield is determined. Similar S(1) and T(1) phototransient absorption spectra occur in (OEP)Pd. However, two Cu porphyrins show only one phototransient absorption spectrum. T(1) absorption results are generally consistent with the available earlier spectroscopic studies made with other techniques. (Modified author abstract)
 
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