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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 4 (1984), S. 444-452 
    ISSN: 0392-6737
    Keywords: Nonlocalized single-particle electronic states
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Le bande di valenza dei tiofosfati FePS3 e NiPS3 sono state studiate utilizzando la tecnica della fotoemissione risonante. Brusche variazioni dell'intensità di alcune strutture degli spettri di distribuzione dell'energia dei fotoelettroni sono state osservate quando l'energia dei fotoni era variata intorno alle soglie di assorbimento 3p del Fe e del Ni. Invece altre strutture mostravano degli spettri di eccitazione lisci. Le prime sono state associate agli stati 3d del metallo di transizione (fotoemissione diretta e satelliti), le seconde agli stati dei gruppi (P2S6)4−. Infine, i risultati ottenuti confermano il modello fortemente ionico di questi composti.
    Abstract: Резюме Мы исследовали валентные зоны тифосфатов FePS3 и NiPS3 с помощью техники резонансной фотоэмиссии. Некоторые структуры кривых энергетичеких распределений обнаруживают быстрые изменения интенсивности, когда энергия фотона проходит через пороги 3p поглощения Fe или Ni. Напротив, другие структуры обнаруживают плавные спектры возбуждения. Первые структуры связаны с переходом ионов металла в состоянии 3d (прямая фотоэмиссии и сателлиты), вторые структуры связаны с (P2S6)4− состояниями. Полученные результаты подтверждают сильно ионную модель этих соединений.
    Notes: Summary We have investigated the valence bands of the tiophosphates FEPS3 and NiPS3 with the resonant-photoemission technique. Some structures of the energy distribution curves show rapid intensity changes when the photon energy is scanned across the Fe or Ni 3p absorption thresholds. Instead, other structures show smooth excitation spectra. We have related the former to the transition metal ion 3d states (direct photoemission and satellites) and the latter to the (P2S6)4− states. These results support also a strongly ionic picture of these compounds.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 7 (1986), S. 379-388 
    ISSN: 0392-6737
    Keywords: Defects in crystals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si riportano le prime misure di tempi di vita dell'emissione dei centri di colore usando uno spettrofluorometro a correlazione di fase e di modulazione in funzione presso il laboratorio del Programma per l'Utilizzazione della Luce di Sincrotrone (PULS, Frascati). Si discutono i risultati relativi ai centri F ed agli aggregati di centri F nel fluoruro di sodio.
    Notes: Summary The first measurements of emission lifetimes in colour centres using a cross correlation phase and modulation fluorometer operating at the synchrotron radiation facility PULS (Frascati) are reported. Preliminary results on the F and F-aggregate centres in NaF are briefly summarized.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 163-168 
    ISSN: 0392-6737
    Keywords: Optical properties of bulk materials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We have measured at room temperature the photoacoustic spectra of Cd1−x Fe x Te(0〈x〈0.055) around the CdTe fundamental absorption threshold. We identified an absorption band at (1.38±0.01) eV, increasing with the Fe concentration, that we assigned to the5 E→3 T 1 transition within the Fe2+ (3d 6) manifold. We observed also a broadening and a shift to higher energies of the CdTe absorption edge for increasingx.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 8 (1986), S. 436-446 
    ISSN: 0392-6737
    Keywords: Visible and ultraviolet spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Abbiamo misurato gli spettri di riflettività di monocristalli di ZnTe, CdTe ed HgTe tra 5 e 35 eV. Oltre i 10 eV gli spettri presentano delle strutture fini, interpretate come transizioni che hanno origine nei livellid piú alti del catione. Questa interpretazione permette di ricavare una rappresentazione schematica della densità proiettata degli stati di conduzione e di ottenere una migliore comprensione sulla natura degli stati finali stessi.
    Notes: Summary We have measured the reflectivity spectra of monocrystalline ZnTe, CdTe and HgTe between 5 and 35 eV. We have interpreted the sharp structures above approximately 10 eV as transitions originating in the metal uppermostd levels. The structures give a picture of the projected densities of states of the conduction bands and supply a better understanding of their states.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 13 (1991), S. 633-645 
    ISSN: 0392-6737
    Keywords: Optical properties of bulk materials ; Refractive index ; reflectivity ; critical angle ; dispersive power ; Transition-metal compounds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Room temperature optical-reflectivity measurements on some transition metal thiophosphates were carried out in the near infrared and visible regions. The resulting spectra, interpreted on the basis of the «transition metal weakly interacting» model, agree well with earlier optical transmission measurements. Below the fundamental absorption edge, the observed features have been assigned to 3d–3d transitions occurring on the transition metal ion, while those observed at photon energies greater than the absorption threshold have been attributed to transitions from the valence bands to discrete 3d orbital levels or to the conduction bands. A more detailed information on the metal ion 3d levels energy distribution with respect to the valence band states belonging to the (P2S6)4- cluster and a more precise determination of the MPS3 absorption edge energy position have been obtained.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 8 (1986), S. 263-278 
    ISSN: 0392-6737
    Keywords: Other interactions of matter with particles and radiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si sono studiate le bande di valenza di FePS3 e NiPS3 con la tecnica della fotoemissione risonante. I risultati sperimentali ottenuti sono in accordo con la nostra precedente identificazione delle strutture della banda di valenza e con un modello di tipo ionico per la descrizione del legame metallo-calcogeno. Le strutture spettrali d'intensità rapidamente variabili al variare dell'energia di eccitazione intorno alle soglie d'assorbimentoM 2,3 del Fe e del Ni sono associate agli stati 3d del metallo di transizione; le rimanenti strutture, non risonanti, sono ascritte invece agli stati del cluster (P2S6)4−. Utilizzando la tecnica yield ad alta risoluzione, si sono misurati gli spettri di assorbimento dei livelli di core di zolfo e fosforo nei tiofosfati di Mn, Fe e Ni. In tutti i composti si riscontrano notevoli somiglianze fra le soglieL 2,3(P) edL 2,3(S). Gli spettri sono pertanto interpretativi in termini di densità proiettata degli stati delle bande di conduzione derivate dagli orbitali del cluster (P2S6)4−.
    Notes: Summary With the resonant photomeission technique we investigated the valence bands of FePS3 and NiPS3. The experimental results, support the ionic picture of the compounds and our previous identification of the valence band structures. The structures rapidly varying in intensity when the excitation energy is scanned across the Fe and NiM 2,3 absorption edge are associated to the transition metal 3d states; the nonresonating features are ascribed to the (P2P6)4− cluster states. With the yield technique we measured the high-resolution absorption spectra of the phosphorus and sulphur inner-core levels in Mn, Fe and Ni thiophosphates. TheL 2,3(P) andL 2,3(S) spectra are similar to each other in all the compounds and are interpreted in terms of the projected density of states of the conduction bands derived from the (P2S6)4− cluster states.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 551 (1988), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 731 (1983), S. 151-160 
    ISSN: 0005-2736
    Keywords: (Microsomal membrane) ; Lipoprotein complex ; Protein release
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Lipids and Lipid Metabolism 1045 (1990), S. 213-218 
    ISSN: 0005-2760
    Keywords: (Mouse) ; Arachidonic acid ; Calcium ; Keratinocyte ; Phospholipid
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0378-4363
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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