Hydrogen spectrum of SS433 system

We propose that the hydrogen spectrum in intense magnetic fields will help clarify the mechanisms which govern the SS433 system. In ultra high magnetic fields the standard hydrogen spectrum is superimposed on the Landau levels. There is, however, one deep-lying level in hydrogen at an energy of 50 eV to greater than 200 eV, depending on the magnetic field strength typical of neutron stars in x-ray binaries. When this level manifests itself it will give an indication of the magnetic field strength at the location of the radiating material; it could thus support the infall model SS433.     

Test of SS 433 models

We present an observational test to distinguish between two alternative SS 433 models.     

Optical results of the black hole microquasar SS 433

We present optical spectroscopic observations of SS 433 during different precessional and orbital phases. Our 2004, 2007 and 2008 data provide us a good chance to study the variability of the Hα line at different orbital phases for nearly the same disk inclination. The data show that the Hα of SS 433 usually had a symmetric profile between orbital phases 0.25–0.75, while an asymmetric structure with a strong red peak was observed for other orbital phases. We suggest that the orbital variability of Hα emission is connected with accretion flow from the donor star to the accretion disk. In addition, we attribute the dramatic increase of Hα emission during our 2007 observational run, which had a time scale of one day, to the emergence of strong jets.

     

受限氢原子光谱高能区的共振增强

通过求解含时薛定谔方程,得到了受限氢原子的光谱结构,发现了明显的共振增强现象,但是在不同的能区限制势对谱线的影响并不一样;此外,还计算了受限氢原子高激发态的抗磁谱受限制势影响而出现的增强现象.     

Lattice QCD: Going beyond the mass spectrum

The present status of lattice measurements with fermions is discussed. Methods are presented which improve the extraction of particle masses using staggered fermions. It is suggested that fermion physics on blocked lattices might show improvement as compared to that on lattices generated with the Wilson action. This idea is tested by comparing results from 18³×42 lattices generated atβ=6.2 with results from the 6³×14 lattices obtained from them by twice blocking with a 3^1/2 transformation. Also, a comparison of 8³×16 blocked and Wilson axis lattices is made. Finally, three point correlators are used to elucidate the properties of the scalar isoscalar channel. On leave from Physics Department, Harvard University, Cambridge Massachusetts 02138.     

Laser excitation of positronium in the Paschen-Back regime

Zeeman mixing of singlet and triplet 2P states of positronium (Ps) atoms, followed by decay back to the ground state, can effectively turn a long-lived triplet atom into a short-lived singlet state, which would seem to preclude laser cooling of Ps in a magnetic field. Here we report experiments which show that, in fact, because of the large splitting of the n=2 states in a high magnetic field (the Paschen-Back regime), the amount of such mixing diminishes approximately exponentially with an increasing magnetic field >0.01 T and is essentially eliminated above ～2 T. Thus, laser cooling of Ps should be feasible at high fields, which will facilitate the production of a Ps Bose-Einstein condensate.     

Non-commutativity of space-time and the hydrogen atom spectrum

There has been disagreement in the literature on whether the hydrogen atom spectrum receives any tree-level correction due to non-commutativity. Here we shall clarify this issue and show that indeed a general argument on the structure of the proton as a non-elementary particle leads to the appearance of such corrections. As a showcase, we evaluate the corrections in a simple non-relativistic quark model with a result in full agreement with the previous one we had obtained by considering the electron moving in the external electric field of proton. Thus the previously obtained bound on the non-commutativity parameter, , using the Lamb shift data, remains valid.Received: 10 October 2003, Revised: 12 November 2003, Published online: 2 July 2004     

The extensive air shower muon number spectrum beyond the knee in the cosmic-ray energy spectrum

The extensive air shower (EAS) muon number spectrum is obtained with increased statistics using the central muon detector of the EAS MSU array, which records muons with energies above 10 GeV. The dependence of the mass composition of primary cosmic rays on the energy is considered. The conclusion is confirmed that for energies from 3 × 10¹⁵ eV (the primary energy spectrum knee) up to 10¹⁷ eV a change in the composition associated with an increase in the proportion of heavy nuclei occurs; however, after the energy of 10¹⁷ eV, the proportion of heavy nuclei begins to decrease and the composition becomes lighter. A comparison with similar data from other experiments is conducted. The existence of an additional component of cosmic rays is confirmed; earlier an indication of its presence was derived from data on the EAS electron number spectrum.     

Measurement of the kaonic hydrogen x-ray spectrum

The DEAR (DAPhiNE exotic atom research) experiment measured the energy of x rays emitted in the transitions to the ground state of kaonic hydrogen. The measured values for the shift epsilon and the width Gamma of the 1s state due to the K(-)p strong interaction are epsilon(1s)=-193 +/- 37 (stat) +/- 6 (syst) eV and Gamma(1s)=249 +/- 111 (stat) +/- 30 (syst) eV, the most precise values yet obtained. The pattern of the kaonic hydrogen K-series lines, K(alpha), K(beta), and K(gamma), was disentangled for the first time.     

低压氢等离子体发光光谱

本实验使用2.45 GHz微波(100～200 W)激励产生低压(1～4 kPa)氢等离子体,通过光纤光谱仪探测氢等离子体的发射光谱,并分析了特征谱线分布及谱线强度随压强、功率的变化情况,计算了氢等离子体的电子激发温度.实验结果表明,压强由1 kPa增加至4 kPa,谱线强度减小;功率由100 W增大至200 W,谱线强度增大.随着压强的增大,电子激发温度减小或先减小后增大.     

Approximate Born-Infeld effects on the relativistic hydrogen spectrum

The Born-Infeld form of the hydrogen atom has a spectrum that can be used to determine the physical viability of the theory, and place an experimentally relevant bound on the single parameter found in it. We compute this spectrum using the relativistic Dirac equation, and a form of the Born-Infeld potential that approximates the self-field corrections of the electron. Using these together, we can establish that if the Born-Infeld nonlinear electrodynamics is to be physically relevant, it must contain a fundamental constant that is well below the original value proposed by Born. This work extends the original Schrödinger spectrum from Carley and Kiessling (2006) [1] for the self-field correction, and shows that using the Dirac equation introduces minor corrections - but also gives access to a range for the fundamental constant that is below that attainable from non-relativistic considerations.     

IR absorption spectrum of hydrogen xanthane

The normal vibration frequencies of hydrogen xanthane are calculated on the basis of a mechanical model. The IR absorption spectrum was measured in the range 400–3600 cm^–1 for tablets of this substance with KBr and in vaseline and fluorinated oil. The spectrum is interpreted. The effects of the change in the structure of the cyclopentane molecule on the vibration spectrum and symmetry of the heterosubstituted molecules are discussed.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii Fizika, No. 11, pp. 50–54, November, 1970.     

Prediction and assignment of the FIR spectrum of hydrogen peroxide

Millimeter and submillimeter microwave studies are used to predict and assign the FIR rotational-torsional spectrum of hydrogen peroxide. Special attention is given to the strong Q-branch features that have recently been used by Traub and Chance to place an upper limit on the atmospheric abundance of hydrogen peroxide. In addition, 67 new transitions are reported in the 400–1000 GHz region.     

Standard radiation spectrum of relativistic electrons: beyond the synchrotron approximation

Radiation emitted by an electron in arbitrary, extreme relativistic motion, has been described for the first time in terms of a standard spectrum of nonsynchrotron type. Ultimately, such a nonsynchrotron spectrum is dependent not only on instantaneous trajectory curvature, but also upon its first two time derivatives and helicity, to provide a basic correction to the synchrotron approximation (SA). A strong deviation from SA has been predicted for above GeV electrons in oriented crystals.     

The relativistic energy spectrum of hydrogen

The exact eigenfunctions of the spin‐orbit‐coupling operators for a relativistic binary system are calculated. Concerning the eigenvalue problem and the radial part of the wavefunction of the bound state, we provide corrections for our previous calculations [1] that contained some sign errors.