scholarly journals Fundamental vibration frequency and rotational structure of the first excited vibrational level of the molecular helium ion (He2+)

2018 ◽  
Vol 149 (15) ◽  
pp. 154302 ◽  
Author(s):  
Paul Jansen ◽  
Luca Semeria ◽  
Frédéric Merkt
Keyword(s):  
Vibration Frequency ◽  
Vibrational Level ◽  
Rotational Structure ◽  
Fundamental Vibration ◽  
Helium Ion

The A2Π–X2Σ+ system of MgCl

1987 ◽  
Vol 65 (12) ◽  
pp. 1594-1603 ◽  
Author(s):  
M. Singh ◽  
G. S. Ghodgaonkar ◽  
M. D. Saksena
Keyword(s):  
High Resolution ◽  
Structure Analysis ◽  
Vibrational Level ◽  
High Frequency ◽  
Low Frequency ◽  
Rotational Structure ◽  
Rotational Analysis ◽  
The Common ◽  
Π State

The A2Π–X2Σ+ system of MgCl has been photographed at high resolution and analyzed for the rotational structure. Analysis of the low-frequency sub-bands of the 0–0, 0–1, and 0–2 bands showed that there is a nonzero Λ doubling in the common vibrational level ν′ = 0, thereby indicating that the A2Π state is regular and not inverted as presumed by earlier workers. Spin-doubling has been seen in the ν = 1 and 2 levels of the X2Σ+ state. Rotational analysis of the high-frequency sub-band has also been done for the 0–0 band.

Predicted Fundamental Vibration Frequency of a Heavy Electronic Component Mounted on a Printed Circuit Board

1999 ◽  
Vol 122 (1) ◽  
pp. 3-5 ◽  
Author(s):  
Ephraim Suhir
Keyword(s):  
Vibration Frequency ◽  
Printed Circuit Boards ◽  
Printed Circuit Board ◽  
Flexural Rigidity ◽  
Practical Importance ◽  
Electronic Component ◽  
Circuit Board ◽  
Circuit Boards ◽  
Fundamental Vibration ◽  
Printed Circuit

External electric leads, soldered into plated through-holes (PTHs) of printed circuit boards (PCBs), provide, in addition to electrical interconnection, mechanical support for heavy electronic components (such as, say, power ones) mounted on the boards. The leads can possibly break (most likely by fatigue), if the PCB support contour is subjected to excessive oscillations. Such oscillations typically occur at the lowest resonant frequency (fundamental frequency). The ability to predict this frequency and possibly avoid resonance conditions is of obvious practical importance. Accordingly, in this analysis, we develop a simple formula for the evaluation of the fundamental vibration frequency of a heavy electronic component mounted on a PCB. The formula is obtained for the case, when the component has only one row of leads, and the vibrations occur in the direction of the least flexural rigidity of this row. [S1043-7398(00)00601-0]

Laser Ionisation Spectroscopy Of Formyl Fluoride

1996 ◽  
Vol 51 (7) ◽  
pp. 809-812
Author(s):  
Reiner P. Schmid ◽  
Harold Jones
Keyword(s):  
Electronic State ◽  
Vibrational Level ◽  
Rotational Structure ◽  
Vibronic Band

A vibronic band of formyl fluoride near 39,511 cm-1 has been observed using multiphoton ionisation spectroscopy. From the analysis of the partially resolved rotational structure, the rotational parameters of the (0, 2, 0, 0, 0, 0) vibrational level of an electronic state near 39,000 cm ~1 have been determined: A = 92.50(1.46) GHz and (B + C)/2 = 11.23(30) GHz. The term value was determined to be 39,510.93(30) cm-1 .

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