Polyvinylpyrrolidone Quantification in Paracetamol Using Phase-Resolved Photoacoustic Method

Preparation, structural and spectroscopic study of sol-gel-synthesized $$\hbox {Cr}^{3+}$$:$$\hbox {Al}_{2}\hbox {O}_{3}$$ powder

“…UV-Vis spectroscopy of the powder sample treated at 1150 • C was obtained using a photoacoustic spectrometer (PAS) as described in detail in Refs. [35][36][37]. PAS is a remote and nondestructive technique capable of measuring thermal and spectroscopic properties of solids, liquids and gases, with minimum sample preparation [36][37][38][39][40] The photoluminescent (PL) spectra of the samples were obtained exciting the samples with a solid-state laser (Coherent, Verdi 2G) operating at 532 nm .…”

“…[35][36][37]. PAS is a remote and nondestructive technique capable of measuring thermal and spectroscopic properties of solids, liquids and gases, with minimum sample preparation [36][37][38][39][40] The photoluminescent (PL) spectra of the samples were obtained exciting the samples with a solid-state laser (Coherent, Verdi 2G) operating at 532 nm . The PL spectrum of each sample was collected by an optical fiber coupled to a linear array spectrometer (Horiba Jobin Yvon, model VS 140) connected to a microcomputer.…”