Temat: 33.20.Kf - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Spectral Study of Caesium Dimer Excited with 476.5, 472.7, 465.8 and 457.9 nm Argon Ion Laser Lines
Autorzy:: Szonert, J.
Bieniak, B.
Tematy:: 33.20.Kf; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1887681.pdf Link otwiera się w nowym oknie
Opis:: The results of a study of Cs$\text{}_{2}$ fluorescence excited by different blue lines of the Ar$\text{}^{+}$ laser are reported. Special attention was paid to the analysis of the narrow fluorescence band at 522 nm. Approximate assignments of the fluorescence transitions were obtained. The origin of the observed fluorescence is discussed and a rough reconstruction of a fragment of the E'(3)$\text{}^{1}$Π$\text{}_{u}$ upper-state potential curve is presented and found to be nearly parallel to the corresponding portion of the ground-state X$\text{}^{1}$Σ$\text{}^{+}$$\text{}_{g}$ potential curve.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The Ångström (B$\text{}^{1}$Σ$\text{}^{+}$ → A$\text{}^{1}$Π) Band System of $\text{}^{13}$C$\text{}^{16}$O: New Observations and Analyses
Autorzy:: Kępa, R.
Domin, U.
Porada, K.
Tematy:: 33.20.Kf; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2035744.pdf Link otwiera się w nowym oknie
Opis:: The emission spectrum of the Ångström system (B$\text{}^{1}$Σ$\text{}^{+}$ → A$\text{}^{1}$Π) of $\text{}^{13}$C$\text{}^{16}$O was recorded and analysed by classical photographical spectroscopy. Under high resolution and with a precision estimated to be 0.010-0.020 cm$\text{}^{-1}$ the bands 1-2, 1-7, and 0-6 were recorded for the first time and the 0-1, 0-2, 1-1, and 1-5 bands were rephotographed and reexaminated. After the rotational analysis of the bands the following constants were calculated: (1) the rotational constants B$\text{}_{v}$, D$\text{}_{v}$ for the B$\text{}^{1}$Σ$\text{}^{+}$ and A$\text{}^{1}$Π states; (2) the equilibrium constants B$\text{}_{e}$,α$\text{}_{e}$, D$\text{}_{e}$, andβ$\text{}_{e}$ for the B$\text{}^{1}$Σ$\text{}^{+}$ state; (3) theν$\text{}_{0}$ band origins. A combined analysis of the currently observedÅ ngström bands and the previously observed Herzberg (C$\text{}^{1}$Σ$\text{}^{+}$ → A$\text{}^{1}$Π) and the (E$\text{}^{1}$ Π → A$\text{}^{1}$Π) bands made it possible to perform a precise relative characteristic of the B$\text{}^{1}$ Σ$\text{}^{+}$(v=0 and 1), C$\text{}^{1}$Σ$\text{}^{+}$(v=0) and E$\text{}^{1}$Π(v=0) Rydberg levels in $\text{}^{13}$C$\text{}^{16}$O. Numerous rotational perturbations observed in the A$\text{}^{1}$ Π state were confronted with the perturbations predicted from the theoretical calculations.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Analysis of the A$\text{}^{1}$Π State on the Basis of the Douglas-Herzberg Bands System in the CH+ Ion Molecule
Autorzy:: Hakalla, R.
Kępa, R.
Szajna, W.
Zachwieja, M.
Tematy:: 33.20.Kf; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2047346.pdf Link otwiera się w nowym oknie
Opis:: This paper presents an attempt of examining the irregularities appearing in a complicated A$\text{}^{1}$Π state of the CH$\text{}^{+}$ molecule with their reasons provided. By using the experimental data for the A$\text{}^{1}$Π-X$\text{}^{1}$Σ$\text{}^{+}$ bands system of the $\text{}^{12}$CH$\text{}^{+}$ ion radical, it was proved that the vibrational and rotational quanta of the upper state reveal the same unusual behaviour, i.e. very clear nonlinear dependence on vibrational quantum number (v'≥3) of the upper state. Therefore, upper vibrational levels (v'≥3) of the A$\text{}^{1}$Π state cannot be determined by means of the equilibrium constants calculated in the previous works. Due to so far unidentified A$\text{}^{1}$Π state perturbations, the reduction of the wave numbers to the rovibronic parameters was carried out by means of individual, band-by-band analysis method, using with this end in view the nonlinear least squares method introduced by Curl and Dane, and Watson. This method allowed one to make already calculated constants of the rovibronic structure of regular lower state X$\text{}^{1}$Σ$\text{}^{+}$ of A-X system independent of possible perturbations appearing in the upper state of A$\text{}^{1}$Π of this system. It also enabled one to calculate for the first time the real (perturbed) term values for the A$\text{}^{1}$Π (v' =0, 1, 2, and 3) state of the $\text{}^{12}$CH$\text{}^{+}$ ion molecule. These values suggest that rotational irregularities in the A$\text{}^{1}$Π state examined are negligibly small. In order to confirm the nonexistence of rotational perturbations in the A$\text{}^{1}$Π (v' =0, 1, 2, and 3) state, up to the observed J$\text{}_{m}$ax level, appropriate graphs of functions f$\text{}_{x}$(J) and g$\text{}_{x}$(J) introduced by Gerö and Kovács, where x = Q, PR, and overline{PR}, were drawn. Also, their course was analysed in detail.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Emission Spectroscopy of AlH: the X¹Σ⁺, A¹Π and C¹Σ⁺ States Characteristics
Autorzy:: Szajna, W.
Zachwieja, M.
Hakalla, R.
Kępa, R.
Tematy:: 33.20.Kf
33.20.Vq; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1493413.pdf Link otwiera się w nowym oknie
Opis:: The visible spectrum of AlH has been investigated at high resolution between 20000 and 21500 $cm^{-1}$ using a conventional spectroscopic technique. The AlH molecules were formed and excited in an aluminium hollow-cathode lamp with two anodes, filled with a mixture of Ne carried gas and a trace of $NH_3$. The emission from the discharge was observed with a plane grating spectrograph and recorded by a photomultiplier tube. The 0-0 and 1-1 bands of the C¹Σ⁺-A¹Π system and 0-2 band of the A¹Π-X¹Σ⁺ were identified at 21126, 21368 and 20276 $cm^{-1}$, respectively. In total 121 transition wave numbers belonging to three bands were precisely measured (with accuracy of ±0.003 cm^{-1}) and rotationally analysed. The new data were elaborated with the help of recent X¹Σ⁺ state parameters reported by White et al. and of the C¹Σ⁺, A¹Π states constants reported by Szajna and Zachwieja. As a result of this merged analysis the set of the molecular parameters and rotational terms values for the three lower lying states of the AlH molecule have been significantly improved.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Spectral and Time-Resolved Studies of Green Cs$\text{}_{2}$ Fluorescence
Autorzy:: Bieniak, B.
Głódź, M.
Jastrzębski, W.
Szonert, J.
Tematy:: 33.20.Kf
34.50.Gb; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1929532.pdf Link otwiera się w nowym oknie
Opis:: The origin and dynamic properties of the green fluorescence of Cs$\text{}_{2}$ excited by laser lines in the 457-488 nm range are studied. Emphasis is placed on the analysis of the 501-527 nrn range. The identified fluorescence line progressions are attributed to the E'(3)$\text{}^{1}$П$\text{}_{u}$ → X$\text{}^{1}$∑$\text{}^{+}$$\text{}_{g}$ transition. An extension of the attractive branch of the E'(3)$\text{}^{1}$П$\text{}_{u}$ potential towards longer inter-nuclear distances is reconstructed by the semi-classical method. A narrow feature at 522 nm is found to be connected with a minimum of the difference potentiał. The lifetime values are measured. The multicomponent fluorescence decays are interpreted as evidence of perturbations of the E'(3)$\text{}^{1}$П$\text{}_{u}$ state by a number of bound and repulsive states of dicherent symmetry. The predissociation rates are estimated.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Aggregated Silver Sols as SERS Substrates
Autorzy:: Kruszewski, S.
Cyrankiewicz, M.
Tematy:: 33.20.Fb
33.20.Kf
33.50.-j; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1490450.pdf Link otwiera się w nowym oknie
Opis:: The unique plasmonic properties of the noble metal colloidal nanoparticles make them promising enhancement substrates for surface-enhanced Raman scattering. Obtaining of systems that provide ever-increasing enhancement of the Raman scattered light is a big challenge. Silver colloids studied here are prepared by Lee-Meisel's method. Rhodamine 6G and rhodamine B are used as probe adsorbates. The "raw" colloids obtained in this way exhibit a characteristic extinction band proving surface plasmons excitation, but do not enhance the Raman signal. Theoretical calculations indicate that the extremely large electromagnetic field is induced in the junctions between metallic nanostructures so some degree of their aggregation is necessary to achieve a sufficient gain value. The addition of aggregating agents (KCl or HCl) leads to significant changes in the extinction spectrum and to significant increase in the intensity of surface-enhanced Raman scattering. The experiments show that chloride can not only promote the aggregation process but also effectively affect chemical mechanisms contributing to surface-enhanced Raman scattering.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Enhancement of FITC Fluorescence by Silver Colloids and Silver Island Films
Autorzy:: Kruszewski, S.
Wybranowski, T.
Cyrankiewicz, M.
Ziomkowska, B.
Pawlaczyk, A.
Tematy:: 33.20.Fb
33.20.Kf
33.50.-j; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1812349.pdf Link otwiera się w nowym oknie
Opis:: Silver colloids and silver island films as fluorescence enhancement systems are the subject of this paper. Enhancement of fluorescence of molecules placed near metallic nanoparticles is a result of resonance interaction of exciting and emitted lights with surface plasmons. Two models explaining this phenomenon are presented. Processes of silver colloids and silver island films forming are described. Results of extinction, absorption and scattering studies of fluorescence enhancement systems are presented. The influence of these systems, i.e. silver colloids and silver island films on the fluorescence of fluorescein-5-isothiocyanate was studied. 7-fold increase in fluorescence intensity of fluorescein-5-isothiocyanate molecules placed near silver nanoparticles was observed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: The C$\text{}^{1}$Σ$\text{}^{+}$ State of KLi Studied by Polarisation Labelling Spectroscopy Technique
Autorzy:: Grochola, A.
Kowalczyk, P.
Jastrzębski, W.
Crozet, P.
Ross, A. J.
Tematy:: 33.20.Kf
33.15.-e
34.20.Cf; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2035622.pdf Link otwiera się w nowym oknie
Opis:: The polarisation labelling spectroscopy method is applied to study the C$\text{}^{1}$Σ$\text{}^{+}$← X$\text{}^{1}$ Σ$\text{}^{+}$ band system of the KLi molecule. Rotationally resolved polarisation spectra are observed in the spectral range of 17150-20350 cm$\text{}^{-1}$. A set of Dunham coefficients describes the C$\text{}^{1}$Σ$\text{}^{+}$ state to 95% of its potential well depth, and the potential curve is constructed by the Rydberg-Klein-Rees procedure. The molecular parameters deduced from this work are compared with theoretical calculations.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Laser Induced Fluorescence of Indium Vapour
Autorzy:: Weyh, T.
Kopystyńska, A.
Kowalczyk, P.
Radzewicz, C.
Tematy:: 33.20.Kf
34.50.Fa; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1891958.pdf Link otwiera się w nowym oknie
Opis:: Indium vapour was illuminated with laser light in the wavelength range 350-372 nm and at 410.3 nm. A few fluorescence bands of In$\text{}_{2}$ as well as a strong background emission of indium-quartz compounds were observed. An evidence of energy transfer processes in indium vapour was found.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Purely Electronic and Vibronic Fluorescence Excitation of Single Terrylene Molecules in a Naphthalene Crystal
Autorzy:: Banasiewicz, M.
Dresner, J.
Morawski, O.
Wiącek, D.
Kozankiewicz, B.
Tematy:: 32.50.+d
33.20.Kf
33.50.Dq; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1814019.pdf Link otwiera się w nowym oknie
Opis:: Fluorescence excitation spectra of spatially resolved single terrylene molecules in a naphthalene crystal were studied at 5 K as a function of exciting laser light intensity. The fully saturated fluorescence detection rate for purely electronic transition (0,0) was found to be about twice smaller than that for the two main vibronic components located 239 and 251 $cm^{-1}$ above. This relation is fulfilled when the triplet population rate $k_{23}$ is much weaker than the depopulation rate $k_{31}$. We propose that the weak fluorescence excitation lines observed at the frequencies of 38, 67, 97, and 145 $cm^{-1}$ correspond to nontotally symmetric low-frequency vibration modes of terrylene.
Dostawca treści:: Biblioteka Nauki

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