Zobrazeno 1 - 10
of 15
pro vyhledávání: '"Dorys Rojas"'
Publikováno v:
Avances en Química, Vol 3, Iss 3, Pp 79-85 (2008)
An energy Ea(1) that varies from 630 to 850 kJ/mol as the mass of Ag increases from 0 to 6,0 μg is obtained for the atomization of Pb. This behavior indicates the formation of clusters, whose size increases proportionally with the mass of Ag. Howeve
Externí odkaz:
https://doaj.org/article/db07f28555784d1ebff97ede69e59cec
Publikováno v:
Spectrochimica Acta Part B: Atomic Spectroscopy. 55:237-262
Extension of the dynamic range of the wavelength-modulated diode laser absorption spectrometry technique
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bc1666ae84373b002bc3c5a4d9737070
https://doi.org/10.1016/s0584-8547(00)00141-5
https://doi.org/10.1016/s0584-8547(00)00141-5
Publikováno v:
Spectrochimica Acta Part B: Atomic Spectroscopy. 52:1937-1953
The influence of hyperfine structure and isotope shift on the detection of Rb atoms in atmospheric pressure atomizers by the 2f-wavelength modulation technique
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::385ace28cea38afdc234ac1f06884e67
https://doi.org/10.1016/s0584-8547(97)00087-6
https://doi.org/10.1016/s0584-8547(97)00087-6
Publikováno v:
Spectrochimica Acta Part B: Atomic Spectroscopy. 52:1663-1686
An investigation of the 2f-wavelength modulation (WM) technique for detection of atoms under optically thin as well as thick conditions is presented. A program that simulates the entire process of laser light modulation, atomic absorption and signal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f16616f3c8b79d2976b879184b7c18d8
https://doi.org/10.1016/s0584-8547(97)00056-6
https://doi.org/10.1016/s0584-8547(97)00056-6
Publikováno v:
Spectrochimica Acta Part B: Atomic Spectroscopy. 52:1269-1281
A study is presented of the effects of the processes of redeposition of atomic vapor on the Arrhenius plots. For that purpose, a kinetic model that considers the redeposition of the initial atomic vapor, and the revaporization of the redeposited spec
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6d0dab0600dd7b1e77c019d6a08510cd
https://doi.org/10.1016/s0584-8547(97)00021-9
https://doi.org/10.1016/s0584-8547(97)00021-9
Autor:
Dorys Rojas
Publikováno v:
Spectrochimica Acta Part B: Atomic Spectroscopy. 50:1031-1044
The effects of copper, ascorbic acid and Triton X-100 on the atomization process of Ag are presented as a function of the initial mass of analyte and the heating rate of atomization. In general, a double pulse structure is detected, at a heating rate
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::49b1a81c3d99d7eabb8a434a27709ec7
https://doi.org/10.1016/0584-8547(95)01319-a
https://doi.org/10.1016/0584-8547(95)01319-a
Autor:
Dorys Rojas, Wilmer Olivares
Publikováno v:
Spectrochimica Acta Part B: Atomic Spectroscopy. 50:1011-1030
A two-precursor kinetic mechanism is proposed to describe the electrothermal atomization of silver. The effects of the superposition of two simultaneous atomization processes on the absorbance profiles and the Arrhenius plots are presented, both by n
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ae1b9aa7702014ac32021d71e955885a
https://doi.org/10.1016/0584-8547(95)01318-9
https://doi.org/10.1016/0584-8547(95)01318-9
Autor:
Dorys Rojas
Publikováno v:
Spectrochimica Acta Part B: Atomic Spectroscopy. 47:1423-1433
The kinetic order of generation of the atomic vapor of Ni is determined as a function of the initial mass of analyte. For masses up to 3.0 ng, a kinetic order equal to 1 is obtained, with atomization energy and pulse half-width independent of the ana
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c1dccd1feb282aa86129ef1cbab84e57
https://doi.org/10.1016/0584-8547(92)80133-2
https://doi.org/10.1016/0584-8547(92)80133-2
Publikováno v:
Review of Scientific Instruments. 63:2989-2993
A compact thermal lens spectrometer was developed using optical fibers and a diode laser for measurements of rare earth species in aqueous solutions. A cw GaAlAs diode laser coupled with a multimode step‐index fiber was used as the excitation sourc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3e7ec95b7f43901f36932e339aa4d1e0
https://doi.org/10.1063/1.1142597
https://doi.org/10.1063/1.1142597
Autor:
Wilmer Olivares, Dorys Rojas
Publikováno v:
Spectrochimica Acta Part B: Atomic Spectroscopy. 47:387-397
A procedure for the determination of the kinetic parameters for the atom formation process in electrothermal atomizers is presented. From the kinetic equations of a mechanism where the rate of atom formation is assumed to have an arbitrary order m, w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a7d9a0acf6fb2d23d5a96ca6f0dd9ec5
https://doi.org/10.1016/0584-8547(92)80033-d
https://doi.org/10.1016/0584-8547(92)80033-d