共查询到20条相似文献,搜索用时 31 毫秒
1.
M. Gallardo F. Bredice M. Raineri A.G. Trigueiros J.G. Reyna Almandos 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2001,15(3):307-314
The spectrum of six-times ionized xenon, Xe VII, has been studied in the 270–6,500 ? using a pulsed discharge. 110 new classified
lines are reported. Ten levels belonging to the odd parity configurations and four belonging to the even configurations have
been determined. To obtain the energy parameters Hartree-Fock relativistic calculations were used. Least-squares parametric
calculation has been carried out to study the fit between experimental and theoretical values.
Received 11 December 2000 相似文献
2.
A.E. Kramida T. Bastin E. Biémont P.-D. Dumont H.-P. Garnir 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》1999,7(4):547-565
Previous works devoted to the Ne V spectrum are very fragmentary and yield a rather controversial picture of this ion. A lot
of unidentified lines are still reported in these multiple studies. In the present paper, Hartree-Fock calculations and least-squares
fits over the whole set of the available data (including the most recent ones) have been performed. As a result, a comprehensive
view of the Ne V spectrum is presented. 10 new energy levels and 40 newly classified lines are proposed. An improved value
of the ionisation potential of Ne V is also proposed.
Received 19 February 1999 and Received in final form 10 June 1999 相似文献
3.
B.K. Ankush A. Venugopalan S.A. Ahmad 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》1999,7(2):139-149
Isotope shifts (-) are reported for 221 spectral lines of the neutral dysprosium atom (Dy I) in the region 470-565 nm using a photoelectric
recording Fabry-Perot spectrometer and highly enriched isotopic samples of and excited in liquid-nitrogen-cooled hollow-cathode lamps. Isotope shift data for 173 of these lines are being reported for
the first time. Using the isotope shift data, term isotope shifts (-) have been evaluated for 99 even- and 68 odd-parity energy levels of Dy I. New values have been obtained for 24 odd and 36 even levels. These new values have enabled us to check some of the existing tentative assignments and also to suggest configuration assignments
to a few unassigned energy levels. The earlier tentative assignments of 4
f10
5
d
6
p configuration to many high odd levels lying above have been presently confirmed. We could assign the 4f95d6s6p configuration to 24 unassigned even levels.
Received: 3 August 1998 相似文献
4.
E.E. Farias M. Raineri J. Reyna Almandos F.O. Borges 《Journal of Quantitative Spectroscopy & Radiative Transfer》2011,112(15):2463-2468
The spectrum of five-time ionized krypton, Kr VI, was recorded in the 240-2600 Å wavelength range, resulting in 61 new classified lines as transitions between levels of configurations 4p3, 4s25p, 4s4p4d, 4s4p5s and 4s4p5p. All the 18 energy levels belonging to 4s4p5p configuration except one were determined. Eight new energy level values corresponding to configurations 4s4p4f and 4p24d, supported by 26 new classified lines were also determined and used in the interpretation of the observed 4s4p5p configuration. The experimental data were obtained from a capillary-discharge tube and theta pinch light sources. Multiconfiguration Hartree-Fock calculations with relativistic corrections and a least-squares fitted parametric calculation has been carried out. 相似文献
5.
I. Mukhopadhyay R. M. Lees W. Lewis-Bevan J. W. C. Johns F. Strumia G. Moruzzi 《International Journal of Infrared and Millimeter Waves》1987,8(11):1483-1502
High-resolution infrared (IR) and far infrared (FIR) Fourier transform absorption spectra have been employed to investigate assignments of FIR laser lines reported from optically-pumped13CH3OH. The spectroscopic measurements are used in conjunction with the reported IR pump and FIR laser frequencies to form closed combination loops for several systems, serving to confirm the assignments and in some cases to improve the accuracy of the FIR laser frequencies. Frequency predictions from combination differences are also presented for a number of potential new FIR laser lines. 相似文献
6.
A. E. Kramida G. Nave 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2006,39(3):331-350
Spectra of neon-filled hollow cathode discharge lamps
were observed by means of high-resolution Fourier-transform spectroscopy
(FTS) covering the region from vacuum ultraviolet to near infrared. By
combining these new measurements with results of other FTS and grating
spectroscopy observations, we compiled a complete list of approximately 1700
spectral lines of Ne II covering the range from 324 ? to 130000 ?.
All known energy levels of Ne II were derived from this line list with
improved accuracy. The newly optimized energy levels were used to derive a
set of Ritz wavelength standards in the vacuum ultraviolet that are in good
agreement with the previously used data. An improved classification of
energy levels was made with the help of parametric calculations, and the
existing controversy in the naming of strongly mixed levels was resolved.
Electronic supplementary material Online Material 相似文献
7.
André Knie Nils BurbankPhilipp Schmidt Christian OzgaArno Ehresmann 《Journal of Electron Spectroscopy and Related Phenomena》2012
EUV-Spectra of electron-impact induced fluorescence from rare gases were recorded for an impact energy of 3.5 keV intending their application in the first step for spectrometer wavelength scale calibrations. The spectra are in the investigated range of 165–314 nm in good agreement with previously measured and calculated spectra. Nearly all observed lines could be identified including 196 new lines. 183 lines mainly for krypton and xenon could not be identified. The spectra are presented and discussed. A compendium of 1670 lines and their identification is added as supplementary tables. The spectra show a number of strong lines which are well suited for spectrometer wavelength scale calibrations and once their intensity relation is deduced can be used for a sensitivity determination of a spectrometer–detector combination as described in the introductory and experimental sections of the paper. 相似文献
8.
A. E. Kramida M.-C. Buchet-Poulizac 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2006,38(2):265-276
All experimental data on Ne VII, including
previously unpublished beam-foil spectroscopy data, have been compiled and
critically evaluated. More than a hundred spectral lines have been newly
identified. For 40 transitions, the previous identifications have been
revised. These revisions resolved all existing contradictions between
previously published interpretations of the spectrum. An optimized level
scheme has been derived from the total list of observed lines. About a
hundred new energy levels have been found, including several highly excited
hydrogenic levels. Based on these newly determined levels, as well as on the
analysis of theoretical data, the ionization potential has been newly
determined with improved confidence.
Electronic supplementary material Online Material 相似文献
9.
本文利用浓度调制的万法测量了氪原子在11870~12700 cm~(-1)波段的高分辨连续吸收光谱.在实验中,通过对氪气和氦气混合气体进行放电的方法制备氪原子.总共测量了120根氦原子吸收谱线,其中33根谱线是已被报道过的,45根新测量的谱线可以通过已知的氪原子能级进行标定,其它剩下的42根新测量的谱跃迁线根据已知的氪原子能级信息尚无法进行标定.本次实验中的这些未知的42根氪原子的跃迁谱线,可以推断氪原子有尚未被报道或测量过的原子能级存在.本文同时对如何用"Classification"计算软件分析未知氪原子谱线的可能存在的能级进行了演示. 相似文献
10.
N. Jaritz H. Jäger L. Windholz 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2002,18(3):267-276
We have classified about 200 new lines and have discovered 13 energy levels with even parity and 1 level with odd parity by
means of the systematic hyperfine structure investigation of a large number of spectral lines of the neutral tantalum atom.
For the new levels we deduced their angular momenta, parity and magnetic hyperfine interaction constants A as well as the electric quadrupole interaction constants B.
Received 8 August 2001 相似文献
11.
通过研究线状激光等离子体的轴向光谱,辨认和归类了一些高离化态钛离子的谱线,并发现钛等离子与表层氧化物离子体的相互作用导致轴向发射光谱强度变化的现象。 相似文献
12.
自由基分子NH2ν2带CO激光磁共振π谱的观测 总被引:5,自引:5,他引:0
采用高灵敏度、高分辨率激光磁共振光谱(LMR)方法在6μm谱段测量了自由基分子NH2ν2带的π谱(ΔMJ=0).测量了前人已测过的谱,结果与之较好符合.并观测到了前人没有观测过的新谱,在3支激光谱线下共获得约13支塞曼(Zeeman)跃迁谱线,其中在2支激光谱线下新测得的谱线10支.利用我们已经测得的[8]σ谱的新的共振谱线的数值和已取得的激光磁共振谱线的标识方法,可预期得到NH2的一些新的分子参数. 相似文献
13.
J.C. Pickering V. Zilio 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2001,13(2):181-185
High resolution spectra of neutral silver have been recorded by Fourier Transform Spectrometry in the region 2 000-8 280 ?(50
000-12 000 cm-1) with silver-neon and silver-argon hollow cathode lamps as sources. This work represents order-of-magnitude improvements,
compared to previous work on Ag I, in accuracy of transition wavelengths and wavenumbers, and energy level values. 35 classified
Ag I transitions are given, and the wavenumber uncertainty for the strongest lines is less than 0.002 cm-1. Improved values for 28 energy levels are presented.
Received 31 January 2000 and Received in final form 13 June 2000 相似文献
14.
Reginald Colin 《Journal of Molecular Spectroscopy》2010,263(1):120-122
An improved set of molecular constants and term values are given for the X2Π (v = 0-5) state of the CH radical. They are derived from a fit of previously published data and additional lines taken from infrared solar spectra recorded on orbit and from new laboratory IR emission data. 相似文献
15.
J. P. Sattler T. L. Worchesky M. S. Tobin K. J. Ritter T. W. Daley W. J. Lafferty 《International Journal of Infrared and Millimeter Waves》1980,1(1):127-138
Many of the known submillimeter wave emissions of 1,1-difluoroethylene are assigned by using new data from infrared diode laser heterodyne spectroscopy. Six new submillimeter lines are also reported and assigned. 相似文献
16.
The vibration–rotation spectra of NH have been reinvestigated using laboratory spectra and infrared solar spectra recorded from orbit by the ACE and ATMOS instruments. In addition to identifying the previously unobserved 6–5 vibration–rotation band in the laboratory spectra, many additional high N rotational lines have been observed. By combining the new observations with the previously published data and recent far infrared data, an improved set of molecular constants and term values have been derived for the X3Σ− and A3Π states. 相似文献
17.
A. E. Kramida M.-C. Buchet-Poulizac 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2006,39(2):173-188
All experimental data on the
valence-shell-excited and core-excited spectra of Li-like neon, including
previously unpublished beam-foil spectroscopy data, have been compiled and
critically evaluated. Seventeen spectral lines have been newly identified.
Sets of recommended energy levels have been derived from the total list of
observed lines and from selected results of theoretical and semi-empirical
calculations. An accurate value of the ionization potential has been derived
from existing theoretical calculations.
Electronic supplementary material Online Material 相似文献
18.
This paper reports that the absorption spectra of H2O^+ have been measured by tunable mid-infrared diode laser spectroscopy in the spectral range of 1100-1380 cm^-1. The H2O+ ions are generated in an AC glow discharge of the gaseous mixtures of H2O/He and detected with the velocity modulation technique. Forty new lines are assigned to the ν2 fundamental band of H2O^+ (X^2B1). The observed lines together with other data published previously are fitted to the standard effective Hamiltonian of an asymmetric top, yielding a set of improved rotational constants, spin-rotation constants and their quartic and sextic centrifugal distortion constants for the ν2=1 vibrational state of H2O+. 相似文献
19.
F.P. Pesl S. Lutz K. Bergmann 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2000,10(2):247-257
Improved molecular constants for the and states of the NaH molecule are presented. NaH molecules are produced by reactive scattering of H and Na2 in a crossed beam experiment. High vibrational levels (6 9) of the NaH molecules are predominantly populated. Their excitation spectrum in the range has been measured using a new variant of Doppler spectroscopy. The transition frequencies involving the vibrational levels
2 8 in the and 6 9 in the state have been determined with an accuracy of better than . Using also previously published data a new set of molecular constants for the and state is derived. In particular, the vibrational dependence of the rotational constants B, D and H as well as some of v”-v' band origins for and is determined. The transition frequencies measured here or published previously are reproduced by these new coefficients
with an accuracy of 0.1 cm-1 [rms value] with a maximum deviation of 0.4 cm-1. New RKR potential energy curves have been calculated up to the turning points of the levels v” = 9 in the state and v' = 25 in the state.
Received 21 August 1999 相似文献
20.